In the Flashback preview, when a player with CPM applied moves between dimensions, that player reverts to the default skin.

[alumina6767]

As shown in the video, when I change the model using Customizable Player Models and then move between dimensions, the player's appearance reverts to its original state.

Fabric 26.1.2

Customizable Player Models [0.6.26a]
Fabric API [0.149.1+26.1.2]
Flashback [0.40.0]

This issue is likely to occur even when installing Customizable Player Models and Flashback Compat with versions other than 26.1.2.