I don’t think I have any great answers for you, but I have two thoughts:
In my grub screen, I have 6.8.9, 6.8.10, and 6.8.11 available as choices. Does this also not work on 6.8.11 or do you only have Fedora configured to keep one old kernel version some how?
If your system boots into 6.8.9 just fine, can you disable the swap volume and try 6.8.10 again? If it works, you at least know what’s wrong…