The most reliable fix is to get Windows to use UTC for the hardware clock, which is usually the default on Linux. (It's more reliable because it means the hardware clock doesn't need to be adjusted when DST begins or ends, so there's no need for the OSs to cooperate on that.)
That flag has been broken for at least several Windows versions, unfortunately. A shame, given that that's the only sane way of using the RTC in the presence of DST or time zone shifts...
That's exactly the type of Windows-ism I'm talking about. Two options (use UTC or the local time), and Windows chose to pick the nonsensical one.
https://wiki.archlinux.org/title/System_time#UTC_in_Microsof...