That shouldn't happen and is probably down two something weird in the database (of time offset).

Can you give no full access to a copy of the Joomla 3 setup, so I can do some tests?
Can you give me (super) admin, (s)ftp and database (PhpMyAdmin) access to that setup?
You can use the 'Confidential information' button in the forum editor to hide sensitive information.

I can't log in to the siteground tools, as it has 2-factor authentication.

I made some changes to the install script, which should now ignore disabled assignment types.
I haven't tested it. But you can test it yourself if you want:
regularlabs.com/development-releases

To check if it works, delete the _conditions and _condition_... tables and replace the _advancedmodules table with the one from the J3 setup.
Then install the dev version.

I am happy to debug this further to fix the conversion script.
But I would need access to the database to see what is going on...

No, there isn't an easy way to search for that in the module manager or Conditions component.