internal server error due to wordpress 5.5 upgrade

Greetings! I have just had to contact the hosting site of to resolve an internal server error . After speaking with support they had to revert back to WordPress 5.3 to solve the error. I was told this is due to upgrading to 5.5 and a plugin is not compatible with the upgrade. How can I find which plugin is incompatible? :slight_frown: