findAnomalies.php was removed in 2022. The wiki page for it still contains a script, but it no longer works.

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In my case, I used AttachLatest:
Run

cd /path/to/your/wiki
maintenance/run AttachLatest

This will list what would be changed. If this shows some changes, run

maintenance/run AttachLatest --fix

If not, or it still doesn't work, you can reattach all pages via

maintenance/run AttachLatest --regenerate-all --fix