I have a bug with the new WordPress 5.6 update. Practically when I try to edit the question it doesn't work (after posting it) while for comments and answers it works
Hi @xfok,
Could you please record a video with the issue and leave it here?
Also please make sure the Console tab is open when you record the video.
Yes, editing the first post in a topic does not work after the 5.6 update.
Install https://wordpress.org/plugins/enable-jquery-migrate-helper/
In the plugin in settings set the jQuery Version to "Legacy". This should return the ability to edit the first posts in a topic. Note this is only temporary fix.
The logger from that plugin reports deprecations in /wpforo/wpf-assets/js/ajax.js:
jQuery.fn.blur() event shorthand is deprecated
jQuery.fn.keydown() event shorthand is deprecated
jQuery.fn.blur() event shorthand is deprecated
wpForo update is coming today. This issue is already fixed.