Error 500 when switching to PHP8.0

[rhodes]

I'm getting a strange error when posting when I switch my forum (Xenforo 2.2.2) to PHP 8.0.

At first glance everything looks fine, but posting no longer works as it should.

If I enter a post and press the submit button, the post does not appear immediately in the discussion thread as usual.

Instead, a message appears saying ‘Posts have been made since you accessed this page’

A reload of the page shows the new post.

However, my users don't understand this and press the submit button...

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Error 500 when switching to PHP8.0

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