invalid version tag when migrating from halite 4.8.0 to 5.1.0

We've recently tried to upgrade our halite version from 4.8.0 to 5.1.0, but as soon as the upgrade finished we started receiving "invalid version tag" exceptions:

$symmetricKey = KeyFactory::deriveEncryptionKey(
        new HiddenString(XX_PASSPHRASE_XX),
        base64_decode(SALT__XX__XX), 
        KeyFactory::INTERACTIVE,
        SODIUM_CRYPTO_PWHASH_ALG_ARGON2I13
);

$resource = fopen('php://memory', 'w+');
File::decrypt(new Halite\Stream\ReadOnlyFile(self::ENCRYPTION_STORAGE.$keyName.'Private.key'), new Halite\Stream\MutableFile($resource), $symmetricKey);

Is there possibly a breaking change between the 2 versions that we're not aware of?

paragonie / halite

invalid version tag when migrating from halite 4.8.0 to 5.1.0 #187