

Monstera Mint browning underside—advice?
A couple of weeks ago I adopted this juvenile Monstera mint from a plant shop. It is my third Monstera, but the youngest I have cared for.
It was in a pretty water retentive soil so I waited a week to let it adjust and then repotted it in a more well-draining aroid mix. I watered the mix and let excess water drain out the drainage holes, then haven’t watered it since (a week). It sits by a west facing window and has a grow light about 6-8inches away from the leaves for 12 hours a day.
A couple of days ago, the leaves’ underside suddenly started turning brown like this.
What is going on—underwatering/overwatering? I wiped it down with a wet cloth for pests and don’t see any, and I didn’t see root rot.
Can the plant come back from this?