Among other things, the old adapter can’t run modal dynamic simulations (see if you can run the tutorial proposed at Modal dynamic simulation of the perpendicular flap with CalculiX by boris-martin · Pull Request #284 · precice/tutorials · GitHub ) nor simulations involving hexaedral elements with nodal meshes (see if you can run Added CalculiX case for flow-over-heated-plate by boris-martin · Pull Request #271 · precice/tutorials · GitHub )
Also, running ccx_preCICE --version should be a hint. I’m not sure if it would give the CalculiX version or the adapter version.