I remounted with : -o rescan_uuid_tree and did a scrub. Scrub says everything is fine: turnip:~ # btrfs scrub status /slow scrub status for ea5898b2-3e9f-4a4b-ae54-5e3e1d13c3ff scrub started at Sun May 8 16:24:33 2022 and finished after 08:10:37 total bytes scrubbed: 5.10TiB with 0 errors