I have 112 flows and a number of those use time, time & date, or sun events (using the Sun Events app for things like sunrise, sunset etc) triggers. And I haven’t had any problems with them triggering at the correct time.
I have had the odd issue with Aqara FP300 presence sensors detecting presence, but associated advanced flows not always starting. But never noticed any issues with time triggers, they’ve always been solid. So there has to be something funky going on with SHS and possibly the interaction with the VM it’s running on. Perhaps a problem with the OS syncing time to the VM host?