Seems like I am not the only one having problems with ajax not functioning since WordPress 5.5 version. I am using the PRO version of wp hide on Apache, everytime I activate rewrites it is causing the admin interface to break, some scenarios are:
Media library not showing.
Plugin settings tabs not clickable.
When rewrite is deactivated, everything is working fine but once rewrite is activated again, im back with the dilemma.