The bug
When creating a new world, on the gamerule menu, the doMobLoot and doTileDrops gamerules have the same description:
Controls resource drops, including experience orbsHow to reproduce:
Click create new world button in single player mode
Click gamerules button
Scroll down to "Drops" category
Hover over the last two labels in this category
❌ Both show the same text
Confirmed fixed in 1.16-pre5