Strengthen nested update counter test coverage #15166
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This ensures their behavior is consistent when run in isolation, and that they actually test the cases they're describing.
These cases explicitly verify that we reset the counter in right places.
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This adds isolation between tests because they used to interfere (e.g. with a change to the logic, a test could fail with other tests but pass when focused).
After adding isolation, I found a few situations that aren't really covered by existing cases alone, but that are important to test. So I'm adding explicit cases for those.