I can confirm Some details on this. The crash affects servers as well as single player worlds. The Server crashes when on a server but not the game but when in single player the game does crash. The crash only happens when a dispenser fires bonemeal into a block of grass. If its not bonemeal or grass it won't crash. That says it is something to do with the flower or grass growing code in relation to dispensers.
I can confirm Some details on this. The crash affects servers as well as single player worlds. The Server crashes when on a server but not the game but when in single player the game does crash. The crash only happens when a dispenser fires bonemeal into a block of grass. If its not bonemeal or grass it won't crash. That says it is something to do with the flower or grass growing code in relation to dispensers.