The idle bug afflicting Gen 1 Ryzen CPUs — for which disabling C6 was a workaround — was addressed in AGESA update 1.0.0.2a which was incorporated into pretty-much all BIOS updates by the end of 2018. It exposed a “Power Supply Idle Control” option in the BIOS (located somewhere like Advanced » AMD CBS » Zen Common) which let you switch from the default setting to “Typical”. That solved the problem (freezes and restarts when idle) for the majority of folks. Certainly did for me.
Are you saying that changing “Power Supply Idle Control” disables Precision Boost on a 3000?