Placing an upwards facing dispenser and a grass block with a flower on top, surrounded by other grass, then putting bone meal in the dispenser and activating it causes the game to crash 90% of the time. Tested multiple times on Windows 10 edition and IOS edition on version 1.14.60. Tested with multiple flowers and multiple biomes, and still crashes the game.

In short, bone mealing a block of grass that has a flower on top from underneath crashes the game.