I made some more tests. The problem is miniz Miner with version 2.2c it doesn´t work. With 2.1c it is working with your commandline.
Good point. Previously I was testing with 2.1c only and everything looked fine no matter how many times I tried to reproduce this issue.
With 2.2c it isn't working no matter if I do --pers auto or --pers=auto. If I instead go to the Options dialog, Online Services, then edit the Nicehash Equihash 125,4 entry and change the Personalization from "auto" to "ZelProof", it's working fine.