Can a character who casts Shapechange and turns into a spellcaster use innate spellcasting to cast spells with a long casting time?
A specific example is when a druid casts Shapechange to turn into a Planetar that has innate spellcasting. They then cast the Commune spell that Planetars can cast 1/day. The problem is, Commune has a casting time of 1 minute, and Shapechange is a concentration spell.
On pg. 202 of the PHB under "Longer Casting Times", it states:
When you cast a spell with a casting time longer than a single action or reaction, you must spend your action each turn casting the spell, and you must maintain your concentration while you do so.
I'm wondering if the spellcasting being innate changes that in some way.