[Cache] fix logic for fetching tag versions on TagAwareAdapter #27158
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There was a problem introduced in #27007 which breaks tag invalidation.
From what I can see there were some cases when the actual tag versions were never fetched from the tags pool and version=0 was used.
@nicolas-grekas this is my attempt of understanding the logic within
TagAwareAdapter
. Please have a look if this makes sense to you 😉