I've not messed around to much mate, just wanted to run it back on stock bios with 19.2.3 at default balanced values. Getting late now, bit tired so I'll play around in the morning to see if at least 1700/1100 Is possible using reduced power limits.
The curious in me wants to try another LC BIOS LOL
@shankly1985 EDIT update
You know what mate, I've got a very interesting video to be posting up tomorrow lol. Long story short, for you and the others. Back on the stock bios 1806, 19.2.3 driver, bug does not appear, everything is perfect again. Just back on my old gaming custom profile which is 1700/1100 frequency....the core is maintaining even higher frequency than it did on the LC 8774 Bios
It's maintaining 1690mhz core right across all benches and games using same lower voltages as previous bios. That's only 10mhz down on the set frequency, where as previously on the LC 8774 bios, setting 1700mhz core would normally work out about 1650mhz average when benching and gaming.
Might push for 1750mhz tomorrow morning then we truly right back to where we were, but it might actually end up being better in the long run. How things work out.