Repair Dataspace.retract() cleanup of handleMap (!)

packages/core/src/runtime/dataspace.ts

@@ -106,6 +106,7 @@ export class Dataspace implements Partial<Entity> {
     retract(handle: Handle): void {
         const v = this.handleMap.get(handle);
         if (v === void 0) return;
+        this.handleMap.delete(handle);
         const is_last = this.index.removeAssertion(v, Turn.active);
         this.options.tracer?.('-', v, this, is_last);
         if (is_last) {