Since about 2 weeks my computers clock does not update on boot anymore for some reason. It does not fall back to a certain date and the CMOS Battery is at 3.288V (checked both with Open Hardware Monitor and in the UEFI) so I don't think that the battery is the issue. It feels like what happens is that when I shutdown my computer that time is saved and simply used when it boots again despite me having activated windows automatic time setting. I can manually refresh the clock by turning that setting off and on again which is rather annoying to do every time.
I have fast startup turned off. It was activated when I first investigated this issue and I disabled it because I had issues with it in the past already.
What is causing this behaviour and how can I solve it?