GASP 5.7 and Metahumans

I’ve been having somewhat inconsistent results trying to get a metahuman into GASP. I don’t want to just add it to the gasp demo, I want a character that I can point to in the game mode.

To this end I prepare the metahumans in a separate project, then migrate them to a plain vanilla gasp project. I duplicate the Sandbox CMC character and copy the meshes from the metahuman into that. I then set up the retarget tags and set the clothing to the Clothing post process ABP.

This works except for one thing I can’t resolve. I can’t hide the original mesh, the UEFN_Mannequin. Well, it hides in the editor but when I run the game, it’s back. I can’t seem to get rid of it.

Other than that the character seems to perform properly, but man is it ugly.

I uncheck the visible box for the mesh in the editor and it seems ok:

But when I run the game, it looks like this:

How can I get rid of this mesh?

Setting theVisible=false and Hidden in Game=true properties on the Mesh seems to work just fine for me.
I am on UE 5.7.