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8c2010f123
Commit 0d861bbb, which added deduplication to nbtree, had _bt_check_unique() pass a TID to table_index_fetch_tuple_check() that isn't safe to mutate. table_index_fetch_tuple_check()'s tid argument is modified when the TID in question is not the latest visible tuple in a hot chain, though this wasn't documented. To fix, go back to using a local copy of the TID in _bt_check_unique(), and update comments above table_index_fetch_tuple_check(). Backpatch: 13-, where B-Tree deduplication was introduced.