If you’re already using Autoptimize, AsyncJS has little to add really.
Re. the blog overview page; clear WP Fastest Cache’s page cache (which has HTML that has references to Autopitmized files that are not there any more) and all should be fine.
Re. editing the page; hard to tell as I can’t see what is going on, unlikely to be related to AsyncJS, but for AO make sure the “also optimize for logged in editors/ administrators” is off maybe (although I doubt this is due to AO, the error might indicate a problem with nonce’s)?
Thanks for the quick help, clearing the cache worked and the problem was solved. It didn’t occur to me because WP Fastest Cache was actually disabled, otherwise that would have been my first option as well
happy to help, have a nice evening! 🙂