beigepetra Just updated earlier today and my tablet that was draining battery multiple times throughout the day has went back to normal battery usage, thanks for the update!
GrapheneOS beigepetra People often think there are changes to battery life either for better or worse after an OS update. It doesn't mean it had anything to do with it. The other possible changes were due to Linux kernel LTS revisions and it's unlikely they had anything to do with either a regression or improvement. All of the changes are listed in the release notes. The Bluetooth changes wouldn't be relevant. Going from 6.1.131 to 6.1.134 didn't really change anything which would improve things either. The previous release similarly didn't change things which would make battery life worse. It's likely you have a network or app which was or still is draining battery. Associating it with updates based on that being the main reason you reboot and updates happening frequently doesn't mean that's related.
yore GrapheneOS I think some people associate the higher battery usage during app optimization with OS updates. My phone gets hotter and drains quite a bit faster while optimizing.