Encrypted values not decrypting on read

[FinnThorwarth]

Hey,
my Model got encrypted fields like:

protected $casts = [
        'first_name' => 'encrypted',
        'last_name' => 'encrypted',
        'email' => 'encrypted',
        'phone' => 'encrypted',
        'address' => 'encrypted',
        'smartphone' => 'encrypted',
    ];

The old and the new value are stored correctly in the revisions. But its not decrypted on read.

Maybe there is a way to set a boolean value that the new and old value are encrypted and on read the values going to be decrypted.