While mining in deepslate, I tried mining diamond ore (diamond in deepslate, not stone) with a gold pickaxe. It did not drop a diamond, happened twice. All other found tickets were using wrong tool level. A brief google search did not mention specific difference in ores in deepslate (and no other ores seem to be affected)

What I expected to happen was...:

A diamond should have dropped from both of the two diamond/deepslate ore

What actually happened was...:

nothing dropped

Steps to Reproduce:
1. Find ore (diamond in deepslate)
2. Mine with gold pickaxe
3. Verify