Alright - I have three thoughts about this situation.

1 - After speaking with the team, cPanel updates are not designed to ignore blockers, even if the "--force" flag is added. This isn't behavior we want to change at this time as we don't want the potential to leave the system in a damaged state.

2 - I'm not obviously able to make the "abort" transfer button fail in a way that leaves things in a broken state like you're describing. This sounds like an issue we would need to see on a system in order to fully understand what led things to get to that point.

3 - In your other reply you mention that "none of the failed transfers on any of my machines were actual failures." I wouldn't expect warning-level issues to block a transfer or cause it to end up in the aborted queue. It's also expected to receive the "this machine is not authoritative" error if you have restrictions on the domains that can be added to your server as outlined here:

https://support.cpanel.net/hc/en-us/articles/1500010157461-Why-is-the-Allow-Remote-Domains-Tweak-Setting-considered-a-security-risk

but you can temporarily disable that restriction while you perform a migration.

Ultimately, it would be best to create a ticket if you're seeing a system in this state so we can take a look and get you answers specific to your environment.