To fix the issue you need to close the start tab (Speed dial). After that it works normally

Also, it makes sense to enable window closing confirmation.

Hopefully that helps.

I'm surprised how long it takes to fix such an annoying bug.

@avl said in Cmd+W closes the window instead of the tab.:

Everyone, my most sincere apologies, I read some information wrong: the fix for the remaining issue that occurs after opening a new window was not backported to O58 in time for the initial release, so it'll only be in the next O58 update to come along. This will be released at the start of next week.

Public bugtracker would help significantly in cases like this. Everyone would be able to track the status of the issue instead of complaining in comments.

To fix the issue you need to close the start tab (Speed dial). After that it works normally

Also, it makes sense to enable window closing confirmation.

Hopefully that helps.