I can open the edit screen of the 'Template for Actors / Models' and I don't see the error in the browser's console, related to other known issue with WordPress 6.5.
Can you please share specific details about what changes you're trying to make, which are not working? I'll be in a better position to suggest the next steps, accordingly.
I used to be able to edit templates in a view like this image. But now I only see code. I want to get back to the block editor mode shown in this picture.
I see the same block editor (Gutenberg environment) when I open the content template editor.
(screenshot attached)
The shortcodes that you see are for the relevant content templates and views, which you can edit from their own editors. This template loads multiple templates and views.