WebGPURenderer: Fix stale occlusion queries (#33959)

src/renderers/webgl-fallback/WebGLBackend.js

@@ -519,6 +519,12 @@ class WebGLBackend extends Backend {
 			renderContextData.occlusionQueryObjects = new Array( occlusionQueryCount );
 			renderContextData.occlusionQueryIndex = 0;
 
+		} else if ( renderContextData.lastOcclusionObject !== undefined ) {
+
+			// invalidate if there is a stale query
+
+			renderContextData.lastOcclusionObject = undefined;
+
 		}
 
 	}

src/renderers/webgpu/WebGPUBackend.js

@@ -822,6 +822,15 @@ class WebGPUBackend extends Backend {
 
 			renderContextData.lastOcclusionObject = null;
 
+		} else if ( renderContextData.lastOcclusionObject !== undefined ) {
+
+			// invalidate if there is a stale query
+
+			renderContextData.lastOcclusionObject = undefined;
+
+			renderContextData.occlusionQuerySet.destroy();
+			renderContextData.occlusionQuerySet = undefined;
+
 		}
 
 		let descriptor;