My error log is full of

[net.minecraft.world.storage.loot.LootTableManager/]: Couldn't parse loot table decorative_blocks:blocks/fir_support
com.google.gson.JsonSyntaxException: Expected name to be an item, was unknown string 'decorative_blocks:fir_support'

This is because in fir_support.json You didn't check if BoP is installed.

Please update those loot tables with a conditional check for a mod. I'm trying to track down a problem of no loot spawning. I don't think it's Decorative-Blocks causing it.

I am having this same issue: https://paste.ee/p/JeKpq

Coincidentally, I am also trying to fix an issue with loot spawning. xD

it's fixed in newer versions (dropped support for 1.14, and this issue isn't a game-crashing bug so I'll close it for now)