Great findings! I may give it a go... I'm deciding whether or not to just purge the W11 volume as I don't use it anyway. That said, I've been hunting down what changes, and been looking at the commits to the grub area. Only found some nice security updates but nothing so far as to shine light on this issue.
https://github.com/rhboot/grub2/commits/fedora-41/
I especially like this one. Even after decrypting disk (TPM or manual), you'd now need to enter pass to edit kernel params etc. https://github.com/rhboot/grub2/commit/5050f7b71334b474abe4b7c5253d1600d35eb...
Anyway, here's hoping they find this issue and patch it.