As of now, the Elementally Infused background only assigns Plane of Air Lore, regardless of the spell chosen for the background. I’ve tried all of the spells and it doesn’t seem to change, but the spell seems to be assigned correctly for each element (bar Ignition, which has already been reported).
Thanks for the report! We’ll take a look and dig into this. The summary of what’s happening with Ignition is that it’s a spell that hasn’t actually been released yet from the remaster, and so it doesn’t work yet.