TNT does not drop blocks in world upgraded to 1.14

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When I ignite TNT it should drop all  the blocks it explodes. But when I do it, nothing drops, it just creates a big hole without dropping anything. To reproduce, simply create a world in 1.13, upgrade it to 1.14, and ignite TNT (I'm not sure if it has to be a super flat Redstone ready world or what) and nothing will drop. I tested it in a new 1.14 world so it's not my copy of Minecraft or anything.