After adding "." in a builder, the previous expression goes red and no member is shown in intellisense

[provide a description of the issue]

Environment

• Operating System: fedora 33
• JDK version: 11.0.9
• Visual Studio Code version: 1.55.2
• Java extension version: 0.77

Steps To Reproduce

1. On a builder expression seems fine, but when I go to add a new part of the builder adding a . , it marks previous expression as wrong and no member is shown

[Please attach a sample project reproducing the error]
Please attach logs
[Error - 12:33:04] Request codeLens/resolve failed.
Message: Internal error.
Code: -32603
java.util.concurrent.CompletionException: java.lang.NullPointerException
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:645)
at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: java.lang.NullPointerException
at org.eclipse.jdt.internal.compiler.ast.ReferenceExpression.copy(ReferenceExpression.java:155)
at org.eclipse.jdt.internal.compiler.ast.ReferenceExpression.cachedResolvedCopy(ReferenceExpression.java:972)
at org.eclipse.jdt.internal.compiler.ast.ReferenceExpression.resolveExpressionExpecting(ReferenceExpression.java:1017)
at org.eclipse.jdt.internal.compiler.lookup.ConstraintExpressionFormula.reduceReferenceExpressionCompatibility(ConstraintExpressionFormula.java:265)
at org.eclipse.jdt.internal.compiler.lookup.ConstraintExpressionFormula.reduce(ConstraintExpressionFormula.java:221)
at org.eclipse.jdt.internal.compiler.lookup.BoundSet.reduceOneConstraint(BoundSet.java:985)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.reduceAndIncorporate(InferenceContext18.java:1124)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.lambda$2(InferenceContext18.java:602)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.collectingInnerBounds(InferenceContext18.java:535)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.addJDK_8153748ConstraintsFromFunctionalExpr(InferenceContext18.java:602)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.addJDK_8153748ConstraintsFromExpression(InferenceContext18.java:571)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.addJDK_8153748ConstraintsFromInvocation(InferenceContext18.java:556)
at org.eclipse.jdt.internal.compiler.lookup.InferenceContext18.inferInvocationType(InferenceContext18.java:421)
at org.eclipse.jdt.internal.compiler.lookup.ParameterizedGenericMethodBinding.computeCompatibleMethod18(ParameterizedGenericMethodBinding.java:271)
at org.eclipse.jdt.internal.compiler.lookup.ParameterizedGenericMethodBinding.computeCompatibleMethod(ParameterizedGenericMethodBinding.java:92)
at org.eclipse.jdt.internal.compiler.lookup.Scope.computeCompatibleMethod(Scope.java:841)
at org.eclipse.jdt.internal.compiler.lookup.Scope.computeCompatibleMethod(Scope.java:798)
at org.eclipse.jdt.internal.compiler.lookup.Scope.findMethod0(Scope.java:1756)
at org.eclipse.jdt.internal.compiler.lookup.Scope.findMethod(Scope.java:1657)
at org.eclipse.jdt.internal.compiler.lookup.Scope.getMethod(Scope.java:3045)
at org.eclipse.jdt.internal.compiler.ast.MessageSend.findMethodBinding(MessageSend.java:1017)
at org.eclipse.jdt.internal.compiler.ast.MessageSend.resolveType(MessageSend.java:838)
at org.eclipse.jdt.internal.compiler.ast.CastExpression.resolveType(CastExpression.java:628)
at org.eclipse.jdt.internal.compiler.ast.LocalDeclaration.resolve(LocalDeclaration.java:390)
at org.eclipse.jdt.internal.compiler.ast.LocalDeclaration.resolve(LocalDeclaration.java:259)
at org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration.resolveStatements(AbstractMethodDeclaration.java:661)
at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.resolveStatements(MethodDeclaration.java:362)
at org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration.resolve(AbstractMethodDeclaration.java:570)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1493)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1618)
at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.resolve(CompilationUnitDeclaration.java:662)
at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.resolve(HierarchyResolver.java:875)
at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.resolve(HierarchyResolver.java:672)
at org.eclipse.jdt.internal.core.hierarchy.HierarchyBuilder.buildSupertypes(HierarchyBuilder.java:129)
at org.eclipse.jdt.internal.core.hierarchy.IndexBasedHierarchyBuilder.build(IndexBasedHierarchyBuilder.java:171)
at org.eclipse.jdt.internal.core.hierarchy.TypeHierarchy.compute(TypeHierarchy.java:323)
at org.eclipse.jdt.internal.core.hierarchy.TypeHierarchy.refresh(TypeHierarchy.java:1319)
at org.eclipse.jdt.internal.core.CreateTypeHierarchyOperation.executeOperation(CreateTypeHierarchyOperation.java:94)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:740)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:806)
at org.eclipse.jdt.internal.core.SourceType.newSupertypeHierarchy(SourceType.java:858)
at org.eclipse.jdt.internal.core.SourceType.newSupertypeHierarchy(SourceType.java:809)
at org.eclipse.jdt.internal.core.search.IndexSelector.getFocusedElementsAndTypes(IndexSelector.java:165)
at org.eclipse.jdt.internal.core.search.IndexSelector.canSeeFocus(IndexSelector.java:72)
at org.eclipse.jdt.internal.core.search.matching.MatchLocator.workingCopiesThatCanSeeFocus(MatchLocator.java:245)
at org.eclipse.jdt.internal.core.search.matching.MatchLocator.addWorkingCopies(MatchLocator.java:201)
at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:249)
at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:601)
at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:670)
at org.eclipse.jdt.ls.core.internal.handlers.CodeLensHandler.findReferences(CodeLensHandler.java:147)
at org.eclipse.jdt.ls.core.internal.handlers.CodeLensHandler.resolve(CodeLensHandler.java:100)
at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$16(JDTLanguageServer.java:674)
at org.eclipse.jdt.ls.core.internal.BaseJDTLanguageServer.lambda$0(BaseJDTLanguageServer.java:75)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
... 6 more

Current Result

Expected Result

Additional Informations

首先，使用所述的 Fedora 33、JDK 11、VS Code 1.55.2 和 Java extension 0.77 环境，创建一个最小的 Java builder-expression 复现。结合报告的 JDT ReferenceExpression NullPointerException，检查 CodeLensHandler.resolve/findReferences 路径；完成的标准是，添加一个点不再将前面的表达式标记为无效，成员补全会出现，并且 CodeLens 请求不会失败。