Issues with lost refs when using MetaHuman Creator and Mutable

I’m trying to use the new Metahuman Creator together with Mutable, after upgrading to UE5.6. A rather annoying issue I have, though, is that every time I want to make an update to a character, that I’ve already implemented in a Mutable Graph, and press assemble again, references to that character’s assets, like a skeletal mesh, inside the Mutable graphs, become “lost” and refer to Engine/Transient.

Which means every time I want to make an update to a character, no matter how small, I also need to find all references inside all Mutable graphs, to any assets related to that character, and fix them. Something that is kinda tedious and rather odd, especially since I didn’t have this issue when re-importing a Metahuman from Bridge in 5.5.