I just posted a question on meta.
I reformulated the question a couple of times, scrolled through the list of "Similar questions" and switched browsers tabs a lot. I hit "Review your question" and later reformulated my Title again.
When clicking on "Post Your question" a spinning icon appeared on that button and at the same time a browser popup popped up, asking me if I want to discard my changes. When I clicked on 'Cancel" there, meta allowed me to save my question again - which failed because the question already existed ("A question with that title already exists; please be more specific.").
This was confusing and probably should not have happened.
I am using Google Chrome 'Version 89.0.4389.90 (Offizieller Build) (64-Bit)' under Windows in an enterprise setup (behind a restrictive proxy, etc.).