I'm trying to save a document, but I'm getting an error ("Error while saving you changes - Click to retry"), but clicking again does nothing, and when I refresh the page, I see that everything was saved successfully. I'm facing the same thing for publishing and unpublishing as well.
After checking the console, I saw that your endpoints return
500 and sometimes
The document used to be saved normally when the custom type was simple, but after adding more fields this error started.
The document UID is: