Add missing test coverage found in #57909

[RyanCavanaugh]

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Comment

#57909 hit two DT tests and 1 user project but didn't affect any compiler baselines. We need equivalent coverage from those breaks

[Andarist]

FYI, I'm already in the process of extracting those test cases

[Andarist]

I'm leaving this here for posterity: TS playground. This one has a React-based repro (and its slimmed down version) - I don't want to include the full-blown React repro in the test suite.