NPE in RemoveUnusedCode pass

I'm getting a NPE in Closure Compiler when running it via the rules_closure Bazel rules. I have not succeeded in creating a small reproducer, so I was hoping for some direction to investigate further.

Imports
```
goog.declareModuleId('corp.searchanalytics.shared.tests.mediumpicker');

import {
default as MediumPicker,
getKey,
AvailableItems,
Buttons,
OptionCategory,
SelectedItems
} from '/src/com/corp/analytics/searchanalytics/searchanalyticsstorm/js/shared/mediumpicker';
```

The code resulting in the NPE:
```
describe('', () => {
const onApplyMock = jest.fn();
const onCancelMock = jest.fn();
...
it('renders without errors', () => {
const container = React.createElement(MediumPicker, { // <-- line 49, identified in the NPE
...
}
);
});

```

Exception:
```
java.lang.NullPointerException: NAME MediumPicker 49 [length: 12] [originalname: MediumPicker] [source_file: bazel-out/darwin-fastbuild/bin/src/com/.../js/shared/tests/mediumpicker_test.js] : ?
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:895)
at com.google.javascript.jscomp.RemoveUnusedCode.getVarForNameNode(RemoveUnusedCode.java:847)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNameNode(RemoveUnusedCode.java:702)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:548)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseCall(RemoveUnusedCode.java:759)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:476)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseDeclarationStatement(RemoveUnusedCode.java:1032)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:528)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseFunction(RemoveUnusedCode.java:1386)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:446)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseCall(RemoveUnusedCode.java:759)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:476)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:557)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseFunction(RemoveUnusedCode.java:1386)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:446)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseCall(RemoveUnusedCode.java:759)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:476)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:557)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:557)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseChildren(RemoveUnusedCode.java:1250)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseNode(RemoveUnusedCode.java:557)
at com.google.javascript.jscomp.RemoveUnusedCode.access$1300(RemoveUnusedCode.java:98)
at com.google.javascript.jscomp.RemoveUnusedCode$Continuation.apply(RemoveUnusedCode.java:1728)
at com.google.javascript.jscomp.RemoveUnusedCode.traverseAndRemoveUnusedReferences(RemoveUnusedCode.java:390)
at com.google.javascript.jscomp.RemoveUnusedCode.process(RemoveUnusedCode.java:365)
at com.google.javascript.jscomp.PhaseOptimizer$NamedPass.process(PhaseOptimizer.java:317)
at com.google.javascript.jscomp.PhaseOptimizer.process(PhaseOptimizer.java:232)
at com.google.javascript.jscomp.Compiler.performOptimizations(Compiler.java:2412)
at com.google.javascript.jscomp.Compiler.lambda$stage2Passes$1(Compiler.java:797)
at com.google.javascript.jscomp.CompilerExecutor$2.call(CompilerExecutor.java:102)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
```

I thought that the `import { default as X }` syntax might not be supported, but a small reproducer seemed to show that working. I'm not sure what else could be the problem.

Thanks