B550 MB. can use Win7 without any problems before update to AGESA Combo-AM4 V2 126.96.36.199, A
Combo-AM4 V2 188.8.131.52 cause Win7 "the bios in this system is not fully acpi compliant" BSOD , AMD should fix it.
Also, Ryzen 4000 series Laptop have Win7 "not ACPI fully compliant" problem too.
AMD, you are not a part of Wintel, you should keep Win7 support at least to 2025 before Bug10 can be a Win10 or Win7 market share lower than 5% (~24% now).