[@robin-w Moderator 3 years, 10 months ago]

Have another question. Is there any reason why the site (bbpress forum only) will break if i upgrade the php from 7.4 to 8.1?

I have run my test site with 8.1 and it works with only warnings.

If it is breaking your site, then you will need to enable debug to find out where the issue is, or try 8.0.x which is also in support.