Settings validation failed. attributes: invalid_value

Hello, good day. I’m working on a client’s website and I migrated it to this personal site to make some requested changes. However, I can’t save any changes because the following error appears: “Settings validation failed. attributes: invalid_value.”

The curious thing is that we’re using the experimental Editor V4, which after migrating to my site doesn’t seem to work. I’m almost certain the issue comes from using that version, but the console errors don’t clearly show where the problem originates.

However, I found this Reddit thread that seems to describe the same problem, although it looks like it happened when using version v3.31.3. I’m not entirely sure, but any help or guidance would be 100% appreciated.

Unable to save/publish Elementor pages. ‘Document already in save progress’ error in console. Ends in 503 error.
byu/vis_chros inelementor

The page I need help with: [log in to see the link]