diff --git a/src/maps/controller.js b/src/maps/controller.js
index 4d0488413..65e06b144 100644
--- a/src/maps/controller.js
+++ b/src/maps/controller.js
@@ -147,25 +147,16 @@ export class MapSourceController {
     if (!tileset) {
       if (!source.createTileset)
         throw new Error(`Missing 3D source: ${source.descriptor.id}`);
-      tileset = await this._cached(
-        this._tilesets,
-        source.descriptor.id,
-        async () => {
-          const value = await source.createTileset({
-            signal: this._abort.signal,
-          });
-          if (this._destroyed) {
-            this._dispose(value);
-            return value;
-          }
-          value.show = false;
-          this.viewer.scene.primitives.add(value);
-          this._ownedTilesets.add(value);
-          return value;
-        },
+      tileset = await this._cached(this._tilesets, source.descriptor.id, () =>
+        source.createTileset({ signal: this._abort.signal }),
       );
     }
     if (gen !== this._switchGen) return;
+    if (!source.tileset && !this._ownedTilesets.has(tileset)) {
+      tileset.show = false;
+      this.viewer.scene.primitives.add(tileset);
+      this._ownedTilesets.add(tileset);
+    }
     this._removeImageryLayer();
     this._credits.show(source.credit || null);
     this._showTileset(tileset);
@@ -325,6 +316,11 @@ export class MapSourceController {
       this.viewer.scene.primitives.remove(tileset);
       this._dispose(tileset);
     }
+    for (const promise of this._tilesets.values())
+      void Promise.resolve(promise).then(
+        (value) => this._dispose(value),
+        () => {},
+      );
     this._imageryProviders.clear();
     this._terrainProviders.clear();
     this._tilesets.clear();
diff --git a/src/maps/controller.test.mjs b/src/maps/controller.test.mjs
index b7a721341..c80a9c769 100644
--- a/src/maps/controller.test.mjs
+++ b/src/maps/controller.test.mjs
@@ -298,3 +298,54 @@ test('invalid source graphs fail before constructing or caching a provider', ()
   assert.throws(() => fixture({ sources: [a, a] }), /unique/);
   assert.throws(() => fixture({ sources: [a] }), /Unknown map fallback/);
 });
+
+for (const reactivate of [false, true]) {
+  test(`a superseded 3D load stays outside the scene and is released (reactivate: ${reactivate})`, async () => {
+    let resolve,
+      destroyed = 0,
+      reads = 0;
+    const tileset = {
+      show: true,
+      isDestroyed: () => destroyed > 0,
+      destroy() {
+        destroyed++;
+      },
+    };
+    const supplied = { show: true };
+    const env = fixture({
+      defaultId: 'slow',
+      sources: [
+        {
+          descriptor: { id: 'slow' },
+          createTileset: () => {
+            reads++;
+            return new Promise((done) => {
+              resolve = done;
+            });
+          },
+        },
+        { descriptor: { id: 'supplied' }, tileset: supplied },
+      ],
+    });
+    const loading = env.controller.setStack('slow');
+    await settle();
+    await env.controller.setStack('supplied');
+    resolve(tileset);
+    await loading;
+    assert.equal(env.primitives.length, 0);
+    assert.equal(supplied.show, true);
+    assert.equal(env.controller.getActiveId(), 'supplied');
+    if (reactivate) {
+      await env.controller.setStack('slow');
+      await env.controller.setStack('slow');
+      assert.deepEqual(env.primitives, [tileset]);
+      assert.equal(reads, 1);
+      assert.equal(tileset.show, true);
+      assert.equal(supplied.show, false);
+    }
+    env.controller.destroy();
+    await settle();
+    assert.equal(env.primitives.length, 0);
+    assert.equal(destroyed, 1);
+  });
+}