From the info you’ve provided, my best guess would be - there’s something wrong with submitted form. Did you add some plugin maybe when it started to fail? What template and blueprint is used for the page you try to save? Is this the full error message?
For future reference, try to add as much information as possible - you might get some answers much quicker.
Other pages of the same website, using the same template and blueprint can be saved normally. It’s only this one that can’t be saved via the Admin Plugin.
So the screenshot alone provides more info than your initial post (where you didn’t mention, that pages of the same template work fine) - it’s a draft. So that narrows guesses down to:
Some value in the submitted form is messing up something
Could you try emptying your inputs one by one and see if it goes through?
Something in the code is not right while working with drafts
Could you try creating a completely new page, save it, and then filling all form at once and see if it goes through?
The “You are editing a saved draft” message only appears in conjunction with the “Save Failed” error (after I try to save the page after a modification via Admin).
The page itself is currently published, and can be saved via SSH with no issues.
I tried creating a new page via Admin, same error seems to be happening:
That’s actually a bit weird. Just yesterday I saved a few pages on my site without any description in Aura. Although I didn’t try creating a new page. Will check some time later