Sims 4 Studio doesn't show my entire pose with custom tongue rig

[nico839]

I'm following this tutorial.
I add the mesh and texture to my pose in Blender, then I add it to my pose package, but when I open it in the game, the pose loads but without the tongue. The tongue appears in CAS and I can add it because I put it in my mods folder, but when I run the pose, the tongue appears but in the default position, not where I placed it in the pose with Blender.