Problem with php 8

[Marc-MMA]

Hello, am I the only one having big problems with php 8 and 8.1?

I delivered 3 projects with php 8.1 and I thought everything was fine. Until I activate the wp_debug, and there it is a festival of errors in php. Everything is in order when I go back to php 7.4.

Can this come from underscores where you do not certify that it is compatible with php 8+?

Can this come from wordpress itself? I don't use any unknown or outdated plugins. It's usually acf, gravity forms, wpml etc. I wonder where the problem may come from.

I would not share php errors they are far too numerous, unless you want to.

Thank you for your return!