Since the end of Codeforces Round 1096 (Div. 3), I've been trying to upload a solution just for the sake of solving the problem, but there's an empty area where the Cloudflare "not a bot" verification widget is supposed to appear, on the right-hand side on the problem statement, in the submission box where one can upload a file containing the solution code. Because the widget was not loading I couldn't use that submission box, so I tracked down the problem and discovered that there seems to be a bug in Codeforces' integration of Cloudflare Turnstile in that part of the site, though I'm not sure exactly why or how it happens.