the tongue chain
I have not kept up with any recent changes to any face rigging templates, so maybe I’m missing something? What is the tongue? Is it something that was in a face template? Or is it a component you made?
What Shifter components are you using for the tongue and jaw? What exactly did you parent to exactly what?
When you say “tongue chain”, are you talking about the joint chain in the rig, or the guides?
Just in case you’re talking about joints: In Shifter, usually joints follow the controllers via matrix constraints. Even if you parent the joints under something new, they will continue to follow their driving controllers. So you need to parent the controllers to each other. Not the joints.
If you want more specific help, please show how you set up your guides.