So I updated my Butterbian-XFCE install to Forky and when I did that it broke the BTRFS from auto updating the grub snapshot menu after an apt transaction. I was able to fix it with the below. This may help someone else who does the same thing.
If you prefer a snapshot menu regeneration during apt transactions instead of (or alongside) the inotify daemon, you can add an apt hook.
sudo nano /etc/apt/apt.conf.d/99update-grub
Paste the following block into the file and save:
DPkg::Post-Invoke {
"command -v update-grub >/dev/null 2>&1 || exit 0; update-grub";
};