Follow-up from "Fix AggregateNumSubDirs"
The following discussion from !4383 (merged) should be addressed:
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@MSevey started a discussion: F/U: Not sure how it was missed, but I don't think there is a unit test that just explicitly verifies the metadata after a bubble. There are a bunch of test cases that are probed but a simple case doesn't seem to exists that verifies all the fields.