Summary
Doing any block updates with a placed amethyst buds/clusters on the side, will break it. The following action that are affected are:
Powering other redstone components (pistons, dispensers, droppers).
Composting plants with a composter.
Using a furnace.
Opening a barrel.
Stepping on redstone ore (which turns lit).
An oxidizing copper.
Original Description
Placing any size of Amethyst Bud on a Redstone Lamp and then powering the lamp will break the Buds/Clusters.
Steps To Reproduce:
Place any Amethyst Bud or Cluster on any side of a Redstone Lamp.
Power the Lamp.
Results: All Buds/Clusters break.
Expected Result: Nothing happens.
Apparently also affected by other blocks, such as:
Powering other redstone components (pistons, dispensers, droppers).
Composting plants with a composter.
Using a furnace.
Opening a barrel.
Stepping on redstone ore (which turns lit).
An oxidizing copper.