It seems that this needs an update as per this comment here.
I am having a similar problem as this user mentioned here.
I’ve described my problem here. It seems that troubleshooting requires an intimate knowledge of ssh-agent and how it interacts with GUI vs. command line.
Edit: I was able to find a temporary solution to my problem by modifying ~/.ssh/config as described in a comment on this guide. In short it was partially a connectivity issue as well as the communication with the VM having been affected (from what I can tell, most seem to be using the KeepassXC form of the setup, not the built-in password utility).