Currently the form_alter hook runs for all forms, and any form with the account key would have it's fields altered. We can tighten this up easily to avoid any unintended changes to other forms.
Check that the form object is an instance of Drupal\user\AccountForm, both the profile and register form extend this class.
Fixed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I added the form ids in the list. This should do the job. If you think we still need use object type compassion - please share your objectives.