Yikes, I can’t keep up with everything.
Hopefully this will be fixed soon on Timeshift’s end, but you can’t use the restore button if you have booted a snapshot through grub-brtfs. The package that just detects read/write snapshots and puts them in your grub menu.
It will appear to work, but does make a mess of your volumes.
But fear not, it’s pretty easy to restore it through the terminal, when booting a snapshot, or from booting a live image.