When manually mounting ~/Private with "ecryptfs-mount-private" for the first time after system boot, it fails to insert the FNEK and mounts the private directory without decrypting filenames. No error message is displayed; it just shows my files as "ECRYPTFS_FNEK_ENCRYPTED.blah.blah-blah".
Unmounting and re-running the command the second time decrypts filenames correctly. However, removing and re-inserting the "ecryptfs" kernel module causes the bug to appear again.
"ecryptfs-insert-wrapped-passphrase-into-keyring" has the same problem. Auto-mounting via pam_ecryptfs works correctly.
ecryptfs-utils 96-1 on Arch Linux