Applying a redstone signal to a dispenser, while the trying to dispense to moving grass blocks will cause the server to crash on a multiplayer world. It produces no crash logs. This isn't a duplicate issue, I can use bonemeal in a dispenser on grass that is stationary, But when it gets actuated by a piston and the dispenser is activated while the grass is moving it creates a hard crash for the server.
Thank you for your report!
We're actually already tracking this issue at MCPE-53033, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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