Thanks for the clear report — looks like this is a known beta bug, not anything you’re doing wrong. The same issue showed up on CLNRest last week (same StartOS version, same cause) and the team fixed it quickly: https://community.start9.com/t/cant-connect-zeus-to-clnrest-onion-interface/5246
I’ve passed your report along to the dev team, so a fix should be on the way — hang tight