Btrfs: "UrBackup Server has trouble storing files to backup storage with the maximum file name length it was compiled with (max 255 bytes)"

Server
1

Getting this error after switching from ext4 to btrfs:

(err_long_create_failed). No such file or directory (code: 2)
UrBackup Server has trouble storing files to backup storage with the maximum file name length it was compiled with (max 255 bytes). There might be issues when backing up files/folders with long file name.

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Now I’m wondering why this message is shown, considering that NTFS and ext4 also have this same length limit.

I looked at the log file and didn’t see an error storing a file with long name or something like that.