Actually there are 2 versions of emulated SMC and the value is important. It's not documented but I have been active in macOS virtualisation for over a decade and discovered the parameters quite some time ago. (Been using VMware since version 1 in 1999)
Update I have dumped the SMC MSSD key for both the Apple SMC versions and there is an incorrect value in smc.version = 1:
V0 = MSSD 01 si8 0xc0 00
V1 = MSSD 01 si8 0xc0 03
