Persistent Storage upgraded on every login

Steps to reproduce

Update an older Tails drive with persistent storage to Tails 5.14.

Expected behavior

Persistant storage is migrated to LUKS2 on initial unlock.

Actual behavior

The "Upgrading the persistent storage" is displayed every time I boot and unlock the drive.

Debugging details

(Dev-only drive, I can provide any other information that would be helpful.)

$ sudo cryptsetup luksDump /dev/disk/by-partlabel/TailsData
[sudo] password for amnesia:  
LUKS header information
Version:           2
Epoch:             12
Metadata area:     16384 [bytes]
Keyslots area:     2064384 [bytes]
UUID:              9fba01b2-183d-476e-b11e-efa49912488a
Label:             (no label)
Subsystem:         (no subsystem)
Flags:           (no flags)

Data segments:
  0: crypt
    offset: 2097152 [bytes]
    length: (whole device)
    cipher: aes-xts-plain64
    sector: 512 [bytes]

Keyslots:
  1: luks2
    Key:        256 bits
    Priority:   normal
    Cipher:     aes-xts-plain64
    Cipher key: 256 bits
    PBKDF:      argon2id
    Time cost:  4
    Memory:     739446
    Threads:    2
    Salt:       76 ba 48 ee 4e 35 77 12 2b 4d f7 44 d6 4d fc af 
                85 7f 7a 2f 7c 48 fa d8 80 2f ef c4 d9 6d a2 84 
    AF stripes: 4000
    AF hash:    sha256
    Area offset:163840 [bytes]
    Area length:131072 [bytes]
    Digest ID:  0
Tokens:
Digests:
  0: pbkdf2
    Hash:       sha256
    Iterations: 281500
    Salt:       7a 00 8b c7 9d 91 7e 75 0d 90 9b de 6b 93 09 a2 
                18 83 f6 14 eb bf b5 d1 4f 18 a8 11 4b 1d fc cb 
    Digest:     94 03 5f 8f 0d 7a d1 43 7c f8 d9 b1 2d 66 e0 01 
                95 87 ae cf 


amnesia@amnesia:~$ free
               total        used        free      shared  buff/cache   available
Mem:         7824372     1663784     3509256      614136     2651332     5255920
Swap:        7824368           0     7824368