Anki 2.1.50 Beta 6+ / Release Candidate

I received the following error while reviewing:

Anki 2.1.50 (742e4a5c) Python 3.9.7 Qt 6.2.3 PyQt 6.2.3
Platform: Mac 12.2.1
Flags: frz=True ao=True sv=3
Add-ons, last update check: 2022-03-23 08:31:58

Exception ignored in: <function HttpClient.del at 0x105e30ca0>
Traceback (most recent call last):
File “anki.httpclient”, line 47, in del
File “anki.httpclient”, line 43, in close
File “requests.sessions”, line 737, in close
File “requests.adapters”, line 326, in close
File “urllib3.poolmanager”, line 222, in clear
File “urllib3._collections”, line 100, in clear
File “urllib3.poolmanager”, line 173, in
File “urllib3.connectionpool”, line 496, in close
File “http.client”, line 959, in close
File “socket”, line 501, in close
File “ssl”, line 1300, in _real_close
File “socket”, line 495, in _real_close
OSError: [Errno 41] Protocol wrong type for socket
Exception ignored in sys.unraisablehook:
AttributeError: ‘ErrorHandler’ object has no attribute ‘flush’

FYI I was using as still-in-development add-on at the time. I don’t believe it to be related but the stack trace isn’t clear about where it’s originating.

I tried to check which beta I was using but I couldn’t find 742e4a5c in the list - am I right in thinking it’s the removed Beta 7? I’ve now downloaded the latest version.