Taking 1 level of wizard lets you learn all spells from all spell lists and cast them as sorcerer spells including with metamagic. I learned haste from a scroll on my 2 wizard/10 sorc - then cast it using a level 3 sorcery spell slot and twinned it.
That's just broken. Apparently the multiclass system is full of problems like this, where you keep abilities even after you multiclass. Like the Warlock ability Necrotic touch which you can keep for free even after you Respec to another class entirely..
So this is just an implementation problem and likely just an unfinished multiclass system.
I think learning from scrolls should be limited to wizard level, not level in general.
