I don’t know what is different but I just updated to 2026.3.0-latest.1 and followed your example and went to Admin→components→versatile banner and the component updated with out an error as in your example
I just thought about issues related to update failures when I saw your suggestion, but here the problem is encountering an issue with the connection to the Git repository when checking for updates, rather than during the update process, so it should be irrelevant to how the update is performed?
The “last checked” date is still incrementing but the error messages still persist, saying the repo can’t be accessed or found, yet it clearly can because I can click the “check for updates” button and it goes away.