CS50p watch.py passes check50 if regex looks for quotes around link

[niktss]

For cs50/problems/2022/python/watch, having a regex like r"\"http(?:s)?://(?:www.)?youtube.com/embed/(?P<vid_id>\w+)\"" shows check50 passing all tests, but the exercise calls for

extracts any YouTube URL that’s the value of a src attribute of an iframe element therein

and the check50 test itself is called "watch.py returns None when given YouTube link outside of an iframe".

If I'm understanding this correctly, check50 should fail a solution that does not check for the presence of <iframe ... ></iframe>