Error media_library_form_element (Missing)

Problem/Motivation

During routine composer updates, dxpr_theme_helper updated from 1.0.4 to 2.0.0.
dxpr_theme was/is at 5.2.1
When running update.php I get an 'unresolved dependency' error, media_library_form_element (Missing).

I did not see anything in the release notes for 1.0.5, 1.0.6 or 2.0.0 to indicate a new dependency on module media_library_form_element.

Did I miss something?

Steps to reproduce

Allow composer to update drupal/dxpr_theme_helper from 1.0.4 => 2.0.0
Run updates - get error:
Requirements problem - unresolved dependency
media_library_form_element (Missing)
DXPR Theme Helper requires this module.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes