If I edit https://en.wikipedia.org/wiki/American_Bank_Note_Company_Printing_Plant with the Visual Editor, when I save my changes, I get a second "Publish changes" dialog, asking me to save the same changes again. When I look at the page and/or page history, I can see that my first save has been completed.
See earlier thread [[ https://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(technical)&oldid=951910166#Save_edit_in_Visual_Editor,_it's_asking_to_save_again? | here ]] for background.
It seems to be completely reproducible on this page, and I'm not seeing this on any other page. I asked another editor to try on their machine and they were able to reproduce this behavior with [[ https://en.wikipedia.org/w/index.php?title=American_Bank_Note_Company_Printing_Plant&diff=951922873&oldid=951913343&diffmode=source | this edit ]].
I'm using:
MacOS 10.13.6 (17G11023)
Chrome Version 80.0.3987.163 (Official Build) (64-bit)
The other editor who testing this was also using Chrome / MacOS, but not sure the exact versions.
I don't know if this is related, but once, earlier today, I got, "Error contacting the Parsoid/RESTBase server (HTTP 4040)".
{F31766292}