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Renaming a tag rewrites history
The edit was approved, and the post currently shows as most recently edited by me. Both the suggested edit page and the post itself, however, shows the tag name as community-proposal.
It appears to me that someone, probably luap42 who approved the edit (but there's no obvious way to tell from the outside), also renamed the tag from proposal to community-proposal.
I don't disagree with this renaming of the tag; however, the act of renaming the tag rewrote history by claiming an edit different from the one made, and there is no indication in the history of any of the several earlier posts (multiple links) that this change has taken place. As far as anyone looking at the publicly visible post histories can tell,
we've always been at war with Oceania the tag was always named community-proposal.
The history of a post should be immutable. This includes post metadata such as question tags. If some event triggers a change, for example by renaming a tag, this should be captured by a history event (which need not necessarily bump the post; often the point of choosing to rename a tag is that one does not want to bump every post that uses the old tag) which records the change.
Doing so would preserve the post history as a record of how it got from what was first posted to what it looks like now.