DSD works fine for me with 18.0.189 as long as I play from Main Library. I have Output Mode: ASIO, and BitStreaming: Yes (DSD over PCM (DoP)). If I click on Output Mode Settings it shows my Device as "Benchmark_DAC2 ASIO Driver", and clicking on the Driver Control Panel brings up a neat little screen (belonging the the Thesycon driver) giving me some further options to set USB Streaming mode, Buffer Size and which shows the Clock Source as "Benchmark DAC2 Internal Clock (Stable 176400)" in the case of DSD. The DSD lights come on on my DAC.
But if I connect to a 18.0.175 library on a different pc and try and play the same file from the remote library, MC still either crashes or hangs "buffering" or stutters if it was playing something. But I can play the offending DSD fine directly from MC 18.0.175 on the second pc. So maybe there is some kind of issue with playing DSDs from a remote library.