Palace of the Dead: Cannot progress as Job on a save file started as Class

[Livilda]

Date & Time: N/A
Frequency: Always
World name: Balmung
Character name: Valeria Vinicius
Retainer name: N/A
NPC name: Wood Wailer Expeditionary Captain
Monster name: N/A
Class/Level: 26 → 35
Party or solo: Both
In-game time: N/A
Area and coordinates: South Shroud (25.2, 20.6)
Housing: N/A
Steps:
1. Start save file in Deep Dungeon as any combat class.
2. Unlock that class' Job (i.e. Thaumaturge → Black Mage)
3. The save file cannot be continued unless reverting to the original class by removing the Soul Crystal.

If this is not a bug, I would like to request functionality be added to the game such that Deep Dungeon save files can be continued after unlocking the Job of the class on which they were started.

[Baxcel]

Its not a bug.. just delete your save and go in again as your black mage.. you won't lose the stats on the armor an weapons you already have.. but you will have to start from either 1st or 51st floor again