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Upgrading to ext4 is not extremely rare, but the recommended procedure involves mkfs and copying files over anyway: https://ext4.wiki.kernel.org/index.php/UpgradeToExt4

In-place upgrades do have the potential to leave some non-default options for the final ext4 file system, such as 128B inodes instead of the 256B ones, which is where certain features like reduced timestamp granularity comes in.

In any case, my system was installed from scratch quite recently using native ext4. As others have pointed out and as I linked in the article, it’s likely a kernel issue. I assume many people have the same thing.

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