引擎从beta16更新到beta19后，打开一个prefab后再去打开一个scene，引擎就会报错，然后无响应
报错信息如下
[Scene] TypeError: Cannot read property ‘path’ of null
at MissingClassReporter.reportByOwner (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/node_modules/cc/polyfill/editor/missing-reporter/missing-class-reporter.js:1:1788)
at Object.reportMissingClass (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/node_modules/cc/polyfill/editor/missing-reporter/missing-class-reporter.js:1:2260)
at Loader.loadUuid (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/uuid-loader.js:309:22)
at Loader.handle (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/loader.js:326:27)
at flow (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/pipeline.js:58:27)
at flow (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/pipeline.js:51:11)
at flow (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/pipeline.js:51:11)
at CCLoader.flowIn (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/pipeline.js:299:15)
at LoadingItems.append (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/loading-items.js:463:28)
at CCLoader.load (/Applications/CocosCreator3D.app/Contents/Resources/resources/3d/engine/bin/.cache/dev/cocos/core/load-pipeline/CCLoader.js:387:17)
[Window] Error: Cannot read property ‘path’ of null
at process:scene
at Object. (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/builtin/scene/dist/panel/message/operation.js:1:883)
at Generator.next ()
at /Applications/CocosCreator3D.app/Contents/Resources/app.asar/builtin/scene/dist/panel/message/operation.js:1:453
at new Promise ()
at __awaiter (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/builtin/scene/dist/panel/message/operation.js:1:230)
at HTMLElement.e.open-scene (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/builtin/scene/dist/panel/message/operation.js:1:809)
at BaseIpc. (/Applications/CocosCreator3D.app/Contents/Resources/app.asar/node_modules/@editor/panel/lib/element.js:1:3826)
