There's been a debate on a D&D discord server that's caused me a lot of trouble. Here is the question: if a wizard 2/cleric 2 has a wizard spell prepared from being a cleric, rather than from being a wizard, then should the wizard-cleric not be able to then scribe that spell into their spellbook the same as if they had it prepared from anywhere else?
Edit: This is different to the bard/wizard question due to bards having spells known, and clerics preparing spells just as wizards do.