After using heightened spell, it remains selected in subsequent turns even if you can’t use it again (e.g. you’re out of sorcery points). Since you can’t use it, it’s greyed out and so you can’t toggle it off. Spells like slow and hypnotic pattern won’t let you cast them with heightened spell without sufficient sorcery points. So basically I was unable to call certain spells at all since I was stuck with heightened spell activated every turn of a battle with no way to turn it off.
Had the same problem with quickened spell. Once you get your sorcery points back you can activate another meta magic and switch that back of. Another bug... meta magic is broken right now.
