Hello,
I noticed that after installing 8.6.2.32267 in my Stage, I was getting harsh buzz with 48khz setting. 44.1khz seemed to be fine.
After reverting back to 8.5.8 that issue was no longer there.
I am using:
Focusrite Scarlett 6i6 2nd Gen
Stage spdif in Auto with both in/out cables connected to interface.