HI
It's doing the same for me - requests from 19 Aug still show pending.
And so I checked one such url that is still in search pages even though the url responds 404 and so gets accepted in the tool.
- The page doesn't exist (the test tool received a 404 error).
So . . .I checked that site's robots txt and sure enough, the webmaster has a 500 crawl delay and Disallow everything.
So in that case, the url will remain in search, since that site is blocking all bots to all urls on its site.
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EDIT
Checked a different url, different site and no robots txt issues. So it seems the MFT is getting the 404.
And since it's been 4 days since that request was made, I sent Feedback via the HELP link top right of that page to send a message to the Search console team.