Fresh install of IPS 4.7.16 and PHP 8.1.27.
Although it shows as fixed in 4.7.13, I still have this in a lot of places when you're with IN_DEV on, such as when trying to edit a topic:
Or when I try to promote the topic:
Several other places where forms are there.
If I set DEBUG_TEMPLATES to FALSE in constants.php, everything works just fine.