diff --git a/js/engine.js b/js/engine.js
index 4eb1d2c..8825632 100644
--- a/js/engine.js
+++ b/js/engine.js
@@ -422,6 +422,11 @@ function buyProject(id) {
         if (!G.completedProjects) G.completedProjects = [];
         G.completedProjects.push(pDef.id);
         G.activeProjects = G.activeProjects.filter(aid => aid !== pDef.id);
+
+        // Final ReCKoning choices should end with no unrelated active research left behind.
+        if (pDef.id === 'p_reckoning_147' || pDef.id === 'p_reckoning_148') {
+            G.activeProjects = [];
+        }
     }
 
     updateRates();
diff --git a/tests/dismantle.test.cjs b/tests/dismantle.test.cjs
index 5603195..3d20b3e 100644
--- a/tests/dismantle.test.cjs
+++ b/tests/dismantle.test.cjs
@@ -208,6 +208,8 @@ showSaveToast = () => {};
 this.__exports = {
   G,
   Dismantle,
+  PDEFS: typeof PDEFS !== 'undefined' ? PDEFS : null,
+  buyProject: typeof buyProject === 'function' ? buyProject : null,
   tick,
   renderAlignment: typeof renderAlignment === 'function' ? renderAlignment : null,
   saveGame: typeof saveGame === 'function' ? saveGame : null,
@@ -452,3 +454,25 @@ test('defer cooldown persists after save/load when dismantleTriggered is false',
   Dismantle.checkTrigger();
   assert.equal(G.dismantleTriggered, false, 'dismantleTriggered should remain false during cooldown');
 });
+
+test('completing the final ReCKoning choice clears unrelated active projects', () => {
+  const { G, PDEFS, buyProject } = loadBeacon();
+
+  G.beaconEnding = true;
+  G.activeProjects = ['p_wire_budget', 'p_reckoning_148'];
+  G.completedProjects = [];
+  G.trust = 10;
+
+  PDEFS.push({
+    id: 'p_reckoning_148',
+    name: 'Rest',
+    desc: 'Final ReCKoning choice',
+    cost: {},
+    trigger: () => false,
+    effect: () => {},
+  });
+
+  buyProject('p_reckoning_148');
+
+  assert.deepEqual(Array.from(G.activeProjects), []);
+});