Put the summary of the bug you're having here
What I expected to happen was...:
When a block is mined, the entity drops near where it was mined from.
What actually happened was...:
At random, the entity of the block that is mined shoots several blocks away sometimes into solid walls causing it to despawn
Steps to Reproduce:
1. grab any tool,
2. cut down trees, mine in tunnels (multilevel tunnels show it best, mine on lower level and watch as some of the blocks go through 2 solid blocks to the upper level.) etc.
3. look around areas that were mined for entities that went flying.
I had a few instances of "didn't I mine more diamond/gold than that?" and randomly finding block entities in caves around where I had been digging before realizing what was going on.
This has been happening quite a lot