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It seems that in dev builds, if you run Find Usages on an identifier which overrides/implements some method in a supertype, you never get any results, despite having checked Search from Base Class. Workaround is to use C-S-P to actually navigate into that base class, then run the search from there.
This looks like a duplicate of #200843, please reopen if it was not fixed in this bug. *** This bug has been marked as a duplicate of bug 200843 ***