Note that the damage of the spell itself is 1d6 to make up for the 1d4 AoE.
Not that I think it shouldn't be changed back - it most definitely should.
There are actually a bunch of other broken things, like I found some gloves (it think it's gloves) that increase the damage of every dart created by Magic Missile by 1d4 psychic (making it (2d4+1)*3 guaranteed damage). Lots of fun mowing down single targets, not so much when I realize that the only reason I'm able to make progress is having OP gear.
It missed the 1d6 damage tidbit, but the point still stands. You take the AoE damage three times regardless of what you do (once at the time of the attack, once as you leave the AoE and then you're still on fire for another turn after leaving it), so that's up to 18 damage, enough to kill most level 2 characters with a single attack. It's bonkers.
