diff --git a/get-shit-done/bin/lib/state.cjs b/get-shit-done/bin/lib/state.cjs
index a7d769f46..6fe9dfa09 100644
--- a/get-shit-done/bin/lib/state.cjs
+++ b/get-shit-done/bin/lib/state.cjs
@@ -239,6 +239,32 @@ function stateReplaceFieldWithFallback(content, primary, fallback, value) {
   return content;
 }
 
+/**
+ * Update fields within the ## Current Position section of STATE.md.
+ * This keeps the Current Position body in sync with the bold frontmatter fields.
+ * Only updates fields that already exist in the section; does not add new lines.
+ * Fixes #1365: advance-plan could not update Status/Last activity after begin-phase.
+ */
+function updateCurrentPositionFields(content, fields) {
+  const posPattern = /(##\s*Current Position\s*\n)([\s\S]*?)(?=\n##|$)/i;
+  const posMatch = content.match(posPattern);
+  if (!posMatch) return content;
+
+  let posBody = posMatch[2];
+
+  if (fields.status && /^Status:/m.test(posBody)) {
+    posBody = posBody.replace(/^Status:.*$/m, `Status: ${fields.status}`);
+  }
+  if (fields.lastActivity && /^Last activity:/im.test(posBody)) {
+    posBody = posBody.replace(/^Last activity:.*$/im, `Last activity: ${fields.lastActivity}`);
+  }
+  if (fields.plan && /^Plan:/m.test(posBody)) {
+    posBody = posBody.replace(/^Plan:.*$/m, `Plan: ${fields.plan}`);
+  }
+
+  return content.replace(posPattern, `${posMatch[1]}${posBody}`);
+}
+
 function cmdStateAdvancePlan(cwd, raw) {
   const statePath = planningPaths(cwd).state;
   if (!fs.existsSync(statePath)) { output({ error: 'STATE.md not found' }, raw); return; }
@@ -273,19 +299,23 @@ function cmdStateAdvancePlan(cwd, raw) {
   if (currentPlan >= totalPlans) {
     content = stateReplaceFieldWithFallback(content, 'Status', null, 'Phase complete — ready for verification');
     content = stateReplaceFieldWithFallback(content, 'Last Activity', 'Last activity', today);
+    content = updateCurrentPositionFields(content, { status: 'Phase complete — ready for verification', lastActivity: today });
     writeStateMd(statePath, content, cwd);
     output({ advanced: false, reason: 'last_plan', current_plan: currentPlan, total_plans: totalPlans, status: 'ready_for_verification' }, raw, 'false');
   } else {
     const newPlan = currentPlan + 1;
+    let planDisplayValue;
     if (useCompoundFormat) {
       // Preserve compound format: "X of Y in current phase" → replace X only
-      const newPlanValue = planField.replace(/^\d+/, String(newPlan));
-      content = stateReplaceField(content, 'Plan', newPlanValue) || content;
+      planDisplayValue = planField.replace(/^\d+/, String(newPlan));
+      content = stateReplaceField(content, 'Plan', planDisplayValue) || content;
     } else {
+      planDisplayValue = `${newPlan} of ${totalPlans}`;
       content = stateReplaceField(content, 'Current Plan', String(newPlan)) || content;
     }
     content = stateReplaceFieldWithFallback(content, 'Status', null, 'Ready to execute');
     content = stateReplaceFieldWithFallback(content, 'Last Activity', 'Last activity', today);
+    content = updateCurrentPositionFields(content, { status: 'Ready to execute', lastActivity: today, plan: planDisplayValue });
     writeStateMd(statePath, content, cwd);
     output({ advanced: true, previous_plan: currentPlan, current_plan: newPlan, total_plans: totalPlans }, raw, 'true');
   }
@@ -882,12 +912,44 @@ function cmdStateBeginPhase(cwd, phaseNumber, phaseName, planCount, raw) {
     updated.push('Current focus');
   }
 
-  // Update ## Current Position section (#1104)
+  // Update ## Current Position section (#1104, #1365)
+  // Update individual fields within Current Position instead of replacing the
+  // entire section, so that Status, Last activity, and Progress are preserved.
   const positionPattern = /(##\s*Current Position\s*\n)([\s\S]*?)(?=\n##|$)/i;
   const positionMatch = content.match(positionPattern);
   if (positionMatch) {
-    const newPosition = `Phase: ${phaseNumber}${phaseName ? ` (${phaseName})` : ''} — EXECUTING\nPlan: 1 of ${planCount || '?'}\n`;
-    content = content.replace(positionPattern, (_match, header) => `${header}${newPosition}`);
+    const header = positionMatch[1];
+    let posBody = positionMatch[2];
+
+    // Update or insert Phase line
+    const newPhase = `Phase: ${phaseNumber}${phaseName ? ` (${phaseName})` : ''} — EXECUTING`;
+    if (/^Phase:/m.test(posBody)) {
+      posBody = posBody.replace(/^Phase:.*$/m, newPhase);
+    } else {
+      posBody = newPhase + '\n' + posBody;
+    }
+
+    // Update or insert Plan line
+    const newPlan = `Plan: 1 of ${planCount || '?'}`;
+    if (/^Plan:/m.test(posBody)) {
+      posBody = posBody.replace(/^Plan:.*$/m, newPlan);
+    } else {
+      posBody = posBody.replace(/^(Phase:.*$)/m, `$1\n${newPlan}`);
+    }
+
+    // Update Status line if present
+    const newStatus = `Status: Executing Phase ${phaseNumber}`;
+    if (/^Status:/m.test(posBody)) {
+      posBody = posBody.replace(/^Status:.*$/m, newStatus);
+    }
+
+    // Update Last activity line if present
+    const newActivity = `Last activity: ${today} -- Phase ${phaseNumber} execution started`;
+    if (/^Last activity:/im.test(posBody)) {
+      posBody = posBody.replace(/^Last activity:.*$/im, newActivity);
+    }
+
+    content = content.replace(positionPattern, `${header}${posBody}`);
     updated.push('Current Position');
   }
 
diff --git a/tests/state.test.cjs b/tests/state.test.cjs
index 721de2871..c6e3bfa11 100644
--- a/tests/state.test.cjs
+++ b/tests/state.test.cjs
@@ -1482,6 +1482,130 @@ describe('milestone-scoped phase counting in frontmatter', () => {
   });
 });
 
+// ─────────────────────────────────────────────────────────────────────────────
+// begin-phase — field preservation (#1365)
+// ─────────────────────────────────────────────────────────────────────────────
+
+describe('state begin-phase preserves Current Position fields (#1365)', () => {
+  let tmpDir;
+
+  beforeEach(() => {
+    tmpDir = createTempProject();
+  });
+
+  afterEach(() => {
+    cleanup(tmpDir);
+  });
+
+  test('begin-phase preserves Status, Last activity, and Progress in Current Position', () => {
+    const stateMd = `# Project State
+
+**Current Phase:** 1
+**Current Phase Name:** setup
+**Total Phases:** 5
+**Current Plan:** 0
+**Total Plans in Phase:** 0
+**Status:** Ready to plan
+**Last Activity:** 2026-03-20
+**Last Activity Description:** Roadmap created
+
+## Current Position
+Phase: 1 of 5 (setup)
+Plan: 0 of ? in current phase
+Status: Ready to plan
+Last activity: 2026-03-20 -- Roadmap created
+Progress: [..........] 0%
+
+## Decisions Made
+
+| Phase | Decision | Rationale |
+|-------|----------|-----------|
+`;
+    fs.writeFileSync(path.join(tmpDir, '.planning', 'STATE.md'), stateMd);
+
+    const result = runGsdTools(
+      ['state', 'begin-phase', '--phase', '1', '--name', 'setup', '--plans', '4'],
+      tmpDir
+    );
+    assert.ok(result.success, `Command failed: ${result.error}`);
+
+    const content = fs.readFileSync(
+      path.join(tmpDir, '.planning', 'STATE.md'), 'utf-8'
+    );
+
+    // Extract the Current Position section
+    const posMatch = content.match(/## Current Position\s*\n([\s\S]*?)(?=\n##|$)/i);
+    assert.ok(posMatch, 'Current Position section should exist');
+    const posSection = posMatch[1];
+
+    // Phase and Plan lines should be updated
+    assert.ok(/^Phase:.*EXECUTING/m.test(posSection), 'Phase line should say EXECUTING');
+    assert.ok(/^Plan:.*1 of 4/m.test(posSection), 'Plan line should show 1 of 4');
+
+    // Status, Last activity, and Progress must still be present (the bug destroys these)
+    assert.ok(/^Status:/m.test(posSection),
+      'Status field must be preserved in Current Position');
+    assert.ok(/^Last activity:/m.test(posSection),
+      'Last activity field must be preserved in Current Position');
+    assert.ok(/^Progress:/m.test(posSection),
+      'Progress field must be preserved in Current Position');
+  });
+
+  test('advance-plan can update Status after begin-phase', () => {
+    // Simulates the full workflow: begin-phase then advance through all plans
+    const stateMd = `# Project State
+
+**Current Phase:** 1
+**Current Phase Name:** setup
+**Total Phases:** 5
+**Current Plan:** 0
+**Total Plans in Phase:** 0
+**Status:** Ready to plan
+**Last Activity:** 2026-03-20
+**Last Activity Description:** Roadmap created
+
+## Current Position
+Phase: 1 of 5 (setup)
+Plan: 0 of ? in current phase
+Status: Ready to plan
+Last activity: 2026-03-20 -- Roadmap created
+Progress: [..........] 0%
+
+## Decisions Made
+
+| Phase | Decision | Rationale |
+|-------|----------|-----------|
+`;
+    fs.writeFileSync(path.join(tmpDir, '.planning', 'STATE.md'), stateMd);
+
+    // Step 1: begin-phase
+    const beginResult = runGsdTools(
+      ['state', 'begin-phase', '--phase', '1', '--name', 'setup', '--plans', '2'],
+      tmpDir
+    );
+    assert.ok(beginResult.success, `begin-phase failed: ${beginResult.error}`);
+
+    // Step 2: advance-plan to go from plan 1 to plan 2
+    const adv1 = runGsdTools(['state', 'advance-plan'], tmpDir);
+    assert.ok(adv1.success, `advance-plan 1 failed: ${adv1.error}`);
+
+    // Step 3: advance-plan again — plan 2 of 2 is the last, should set "Phase complete"
+    const adv2 = runGsdTools(['state', 'advance-plan'], tmpDir);
+    assert.ok(adv2.success, `advance-plan 2 failed: ${adv2.error}`);
+
+    const content = fs.readFileSync(
+      path.join(tmpDir, '.planning', 'STATE.md'), 'utf-8'
+    );
+    const posMatch = content.match(/## Current Position\s*\n([\s\S]*?)(?=\n##|$)/i);
+    assert.ok(posMatch, 'Current Position section should exist after advance-plan');
+    const posSection = posMatch[1];
+
+    // After advancing past all plans, Status should say "Phase complete"
+    assert.ok(/Status:.*Phase complete/i.test(posSection),
+      'Status should be updated to "Phase complete" after last advance-plan');
+  });
+});
+
 // ─────────────────────────────────────────────────────────────────────────────
 // summary-extract command
 // ─────────────────────────────────────────────────────────────────────────────