Hi,
Regarding Issue
#164 on the CalculiX GitHub repository, it seems that defining a prior *TRANSFORM card, aligned with the main axes and applied to the nodes subject to boundary constraints, solves the problem.
This approach was also used to resolve another issue: “Non-axis-aligned beam moment and constraint bugs again”
#124.
I'm using last (Ccx v2.23\Compiled ccx_MKL.exe version)
*TRANSFORM,NSET=TRANSF_NODES,TYPE=R
-1,0,0,0,1,0
https://github.com/Dhondtguido/CalculiX/issues/164