The Wizard Council (long may they live) has decided that it is fine so long as it isn't also cast with the Mend Buttcrack spell, as both spells are too destructive when used in tandem.
I mean, I see where they're coming from, but it's far from the only spells that are strong when cast together, so I think they're probably just responding to the current Wizard meta tbh (you didn't hear it from me though).