For my birthday back in February I received a grow your own mushrooms kit. It’s taken a bit of time to get it started, we had some mushrooms start growing then dry out, and we had trouble with water pooling and going a funny colour.
The instructions said to leave the plastic bag around the growing medium and cut slits for the mushrooms to grow through. This seemed to be the cause of the problems we were having. A large clump of mushrooms managed to grow through a hole in the corner of the plastic bag, which left a big hole when I picked them. I noticed that the next lot of mushrooms was growing well near the hole, but another clump growing under the plastic started out and then died off. I decide to remove the plastic and see if that helped.