Amethyst

Budding amethyst is not supposed to drop anything, see MCPE-130933.

Ohhhhhhhhh now it make sense thanks

But why dont you want us to have an amethyst farm??

See this https://www.minecraft.net/en-us/article/taking-inventory--amethyst-shard it will answer your question.

From the website

Here’s a pro tip ⁠– don’t break the amethyst blocks that have an x-pattern marked on the surface of the block ⁠– the “budding” ones. Why not? Because over time they’ll spawn more clusters of shards for you, but they’re destroyed when broken (or moved by a piston) ⁠– even if you use a silk touch tool. 

That’s not a bug, it’s intentional! I’ll let Minecraft developer Cory Scheviak explain:

"It was important to us that amethyst was not just another ore that you can mine once and take home to grow. By confining the amethyst cluster growth to the budding amethyst block, which you can only find where geodes generate and cannot be moved, we ensured that players have a reason to return to the geode over and over."

• Cory Scheviak

So when you find a geode, it’s a good idea to remember the location somehow, because you’ll want to come back to it again and again to harvest clusters. How will you mark it? Well, that’s up to you.