Nvidia hdmi audio problem with 5.3.16-200.fc30.x86_64

The upgrade from 5.3.15-200.fc30 to 5.3.16 seems to have broken this for me. On one system I'm getting silence, on another the left-hand channel has loud motorboat noises. Both have GT710 and 440.44 I've heard of something similar with 5.4.2 to 5.4.3 Comments or suggestions? TIA John P