When using a dispenser with bonemeal under grass blocks it crashes the game. I have run this experiment on mobile, switch, and laptop (running Bedrock) it will sometimes work if it is a single grass block but when it's a 7x7 square it always crashes as soon as the dispenser is activated. I run a realm and had 2 of my players attempt this as well with the same results. Have also tried in online and offline play.