There's this tread that talks of a late September/early October time frame for an AGESA bump and SinkClose. https://rog-forum.asus.com/t5/amd-500-400-series/sinkclose-cpu-flaw-requires-new-agesa/td-p/1036165One can hope the BIOS update also addresses...
FWIW, I'm the "reelmccoy" on overclock.net. I went from 4702 to 4803, saw the LED firmware was updated and noted the same issue as the OP. I did mention it to the individual that graciously let me test 4803 (thanks!). Even w/o Stealth enabled, the LE...
If there's an updated BIOS to test for the X570 Crosshair VIII (WI-FI) (currently running 4702), I'm willing. I'd have to do some digging around to provide a serial number tho.
