Issues with mautic builder

Your software
My Mautic version is: 4.4.9
My PHP version is: 8.0
My Database type and version is:

Your problem
My problem is:
In general, I’m struggling with the mautic builder. When I make a new theme, the classes in the twig files aren’t automatically added to the elements they’ve been attached to, and/or I have to add the classes in the Style editor, but the class won’t save.

On another note, if I were to make an email using a new theme template and make changes to the twig file, I have to switch to a new theme, save, and then switch back to the correct theme and open builder. Similarly with editing, I have to save and exit the builder, open the preview to see if the changes took place.

These errors are showing in the log:

Steps I have tried to fix the problem: