Can't remove first option in dropdown fields easily

Environment

Discourse Version: Same as the other one

Plugin Commit: Same as the other one

Other Plugins
Same as the other one

Steps to Reproduce

It is easy to delete the 2nd, 3rd, 4th, etc options, and all the remaining options shuffle up nicely.

However, you can’t delete the first one. There is an obvious workaround (copy the 2nd one into the first one and delete the 2nd one) so this isn’t urgent at all - but would be nice to fix when you are in there.

Example

Logs