Loot tables are not working when integrated into a datapack.

Steps :

1. /datapack enable "file/datapack" first
2. /summon stray ~ ~ ~ { DeathLootTable:"test:folder/table1" }

Then the mob drops nothing, even if weight is set to 1000.

Maybe the function set_nbt is no longer supported in 1.13 snapshots.

Here is the file so you can experiment that problem.