In yoshis house the all of the grass (except for the one under the sign) has collision and acts like normal ground. (the grass attached to the house sprite)
Im still kinda new to hacking and idk what I did or how to fix this. (Im not home and I don't have screenshots)
Maybe you should wait until you are home so you can look into it a bit further before making a whole new thread for it. It's most likely just a problem with the Map16, but your description is vague and just sounds like you're talking about the normal ground tiles in the level, which are supposed to be solid. If you mean the decorational grass around the level, then check the Map16 to see if the grass is set to act like 130. You can fix this by importing the first Map16 page from a clean rom. I hope this helps.
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