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https://btrfs.wiki.kernel.org/index.php/Changelog#By_feature don't know how much debian backports btrfs fixes (or new features) changelog here: https://salsa.debian.org/kernel-team/linux/blob/046a5da6eb748c59f7402d5aae84ab7543dbb396/debian/changelog?expanded=true&viewer=simple downgrade could be problematic if you use ZSTD as your compression for example, but not limited to this probably. IMHO - test the downgrade on a separate pc or disk. (and never touch a running system) at least for those running btrfs this kernel switch should be done with extreme caution.