I’m trying to make an automatic seed farm. 

1. I placed a grass block to a sticky piston. And a bonemeal dispenser with a red stone clock facing into the block. The movement of the block breaks the tall grass and the dispenser makes it grow again. It works for about 5 seconds and then realms kicked me off. 

1. I tried off of realms and the game crashed. 

1. I a different red stone clock and the game crashed. 

1. I tried the sticky piston in a vertical direction and the game crashed. 

1. I tried normal pistons abs the game crashed. 

1. I finally tried no pistons. Just me harvesting the tall grass by hand with the dispenser going into the grass block with bonemeal. The game crashed. 

the issue seems to be the bonemeal dispenser shooting into a grass block. 

1. I also tried on windows 10 and the game crashed.