customer_testing failing: type 'Null' is not a subtype of type 'Object' in type cast #123385
Description
>> .\flutter_test_registry\flutter_test_repo_test.bat
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| C:\b\s\w\ir\x\t\flutter_customer_testing.super_editor.3c8f01bf\tests>PUSHD attributed_text
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| C:\b\s\w\ir\x\t\flutter_customer_testing.super_editor.3c8f01bf\tests\attributed_text>CALL flutter test || GOTO :END
| 00:00 +0 -1: loading C:/b/s/w/ir/x/t/flutter_customer_testing.super_editor.3c8f01bf/tests/attributed_text/test/attributed_spans_test.dart [E]
| Failed to load "C:/b/s/w/ir/x/t/flutter_customer_testing.super_editor.3c8f01bf/tests/attributed_text/test/attributed_spans_test.dart": type 'Null' is not a subtype of type 'Object' in type cast
| package:test_api RemoteListener.start.<fn>.<fn>
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| 00:00 +0 -2: loading C:/b/s/w/ir/x/t/flutter_customer_testing.super_editor.3c8f01bf/tests/attributed_text/test/attributed_text_test.dart [E]
| Failed to load "C:/b/s/w/ir/x/t/flutter_customer_testing.super_editor.3c8f01bf/tests/attributed_text/test/attributed_text_test.dart": type 'Null' is not a subtype of type 'Object' in type cast
| package:test_api RemoteListener.start.<fn>.<fn>
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| 00:00 +0 -2: Some tests failed.
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| Testing failed.
see: https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20customer_testing/12080/overview
logs: https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8785773537030190081/+/u/Customer_testing/customer_testing/test_stdout
First appeared with roll commit 077cccd. Appears to be flaky, with 0-3 of the *_customer_testing shards failing each commit. I would have expected all three shards to consistent fail given that the error message seems to indicate a compilation issue.