As you point out layered thermal shell is a beta feature. The main issue is that when you have only have one layer TEMP is the dof name. When you have more than one layer (shell131/132) the DOF names change to TBOT, TE1, TE2,..,TTOP. Mapping these DOFs to the corresponding layers in a structural analysis as temperature load is not supported yet.
You are navigating away from the AIS Discovery experience