The ZORA implementation is not broken. Please try the 6.1 version. A number of new enhancements have been implemented in the current release. Small differences in the final ZORA energies are fine.
For ZORA calculations I recommend using the following:
set dft:tol_rho 1d-30
set int:cando_txs f
set dft:job_grid_acc 1d-20