I've created MB Group Skins for a Cloneable MB Group.
However, those Group Skins do not appear in the dropdown menu for applying skins to a MB Group Element within Elementor.

The display conditions on the MB Group Skin are blank.

Versions
Elementor (Pro): I've tried using both 3.14.1 and the recently released 3.15.1 and the same behavior occurs in both.
Metabox: 5.7.4
Metabox Elementor Integrator: 2.1.10