fix(javascript): preserve capture and property-key effect ownership

src/domain/javascript/javascriptSemanticValues.ts

@@ -4,6 +4,7 @@ import {
   semanticOpaqueBindingReadMayHaveChanged,
 } from "./javascriptSemanticOpaqueEffects.js";
 import * as t from "@babel/types";
+import { semanticKnownSymbolKey } from "./javascriptSemanticPropertyKeys.js";
 import { logicalRightOperand } from "./javascriptSymbolicControlFlow.js";
 
 import {
@@ -864,6 +865,16 @@ const evaluateObject = (
       }
       continue;
     }
+    if (
+      property.computed &&
+      semanticKnownSymbolKey(property.key, context.state)
+    ) {
+      // The string-slot lattice omits symbol names, but they cannot overwrite
+      // established string fields. Keep the omitted inventory explicit.
+      unknownProperties = true;
+      if (omittedProperties !== null) omittedProperties += 1;
+      continue;
+    }
     const name = semanticStaticPropertyKey(property.key, property.computed);
     if (name === null) {
       unknownProperties = true;