Currently, rigid body constraints don’t work with 2D elements in explicit dynamics: Rigid body constraint doesn't work with shell, axisymmetric and plane stress/strain elements in explicit dynamics · Issue #59 · Dhondtguido/CalculiX · GitHub
What’s even worse, shells + rigid body constraints + Nlgeom may result in abnormal convergence issues: Rigid-body constraint convergance problems
So it might be better to use solid elements in this case or avoid rigid body constraints.