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Yes, ComboPi-AM4 1.0.0.3 definitely reduced boost clocks compared to earlier AGESAs. I'm sure they'll fix this eventually.
Might not be a bug...
AGESA 1.0.0.3 Patch ABB on Asus TUF x570. Not noticed any difference yet, 3600x will still only boost to 4267Mhz all by itself.
I get ACB of 4.2GHz regardless of UEFI/AGESA, where I note the difference is when using PBO+xxxMHz, view the 2 WMVs in this ZIP.
Any UEFI using AGESA 1.0.0.2 or earlier results in ~4.3-4.34GHz ACB in non extreme loads, any UEFI using a later UEFI CPU barely breaks past 4.275GHz...