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Lesser restoration didn't restore lost XP on Jan Jansen after having drained levels.
Jan had drained levels by Demon knights in the battle next to Demogorgon statue in Underdark. I immediately let Anomen to cast lesser restoration on Jan to regain lost levels. He regained lost levels, but no XP. He now needs more than 1 200 000 xp to next level.
I tried to simulate problem on other members. I let Minsc and Jaheira be drained and then I let Anomen to cast lesser restoration on them. Their levels and XP points were restored properly.
I repeated the fight again to repeat Jan situation, and after lesser restoration were restored only levels, but XP remains on 666 000. He should have 1783246 xp after restoration.
I have attached saves before the battle and after. Jaheira is multiclass and restoration works properly, so I assume it's not because of that.