Hineni,
Thanks for following up!
It's not quite clear if the suggestions have now solved the disappearing cursor concern. Please let us know if the cursor appears to be stable once again. If the behavior is continuing, there are a few more things we can do to help isolate further. Try the steps below.
Safe mode: It’s a way to start up your Mac so it performs certain checks, repairs, emptying of system cache, and prevents some software from automatically loading: Use safe mode to isolate issues with your Mac - Apple Support. Once in safe mode, check to see if the same behavior continues with your cursor. Sometimes safe mode can successfully resolve some issues. With this being said, after testing in safe mode, restart and log in as normal to see if that helps resolve the issue.
If the issue remains, lets test a new user account next, to isolate if this is a user-specific issue, or a system-wide issue. Here’s how: How to test an issue in another user account on your Mac - Apple Support. Based on the results in the new user, you could continue to the section titled 'If the issue doesn't happen in the other account' or 'If the issue happens in the other account' to continue troubleshooting.
Best regards.