Diffeo Copy/pasting animation to a different armature

Using the normal Blender method of Linking Animation Data from one armature to another (completely identical rig and bones) on rigs with custom morphs breaks custom morphs on the pasted armature.

While the animation and custom morphs are all transferred over, custom morph values on the pasted armature are all set to 0 and becomes unusable.

So I guess my question is, is there a way to copy/paste animation from one to another with custom morphs, while keeping the morphs usable?