Multiple spellcasting classes problem

[Walrus Warwagon]

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Issue Description: I tried it with the wizard>cleric, druid>wizard, cleric>druid combinations. You can freely fill spell slots of only first class you've got. Filled spell slots of the second class will reset as soon as you close the spells menu.
More so, doubling spell slots of your first class will lose the rested status. By doubling I mean, for example, if you put the summon creature 1 into the first slot of your second class, and then first circle 1 slot of your first class can't cast it until the next rest.
Cantrips doesn't seems to be affected.

[Haquin]

Not happening in v6605+