That's just fantastic. And here I was thinking after the recent OpenZFS data loss bug that by staying with the good ol' ext4 I might miss on some nice features but at least it's rock solid.
To be fair, it was just a bug in 6.1.64, which was already fixed in 6.1.66. Both are "old" kernels, so it's nothing to worry about, unless you were deliberately staying on 6.1 for some odd reason (yes, I'm aware 6.1 is LTS, but so is 6.6).
AFAICT Debian was rolling out 6.1.66 but had to stop in order to patch the kernel (Or bump version…? Not sure.)