Q.Found Something On Top Of The Soil In A Flower Bed
I live outside St Louis, Mo. I’m watering my flower bed and I see what looks like a large rock in the soil. When I water it it changes to brown powder. A lot of it and it doesn’t mix with water. It rises like brown smoke. Then it changes back to looking like a rock only bright yellow. When I nudge it with my shoe it breaks and looks like strong yellow paper. It was freaky. Any idea what it is?

Certified GKH Gardening Expert
Unfortunately, your photo did not come through. I am unable to identify the issue. It sounds like some fungal fruiting body. That may be a good place to start.
https://www.gardeningknowhow.com/lawn-care/lgen/eliminate-mushrooms-in-your-lawn.htm