Server crashes when a dispenser is placed inbetween some dirt blocks

Hi there,

I'll like to share with you guys a bug I just found in my realm. When a dispenser is placed in between some dirt blocks and then activated by a lever it simply froze the lever and after some seconds the whole realm server crashes, so everyone in the server is kicked out. When we return to the game a lot of work we made in the last ~10 min is deleted.