Typo in gold ore tag possibly...? It just looks different to the rest of the tags. Should it be ore instead and without hash
file: .gradle\caches\forge_gradle\minecraft_user_repo\net\minecraftforge\forge\1.16.3-34.1.0_mapped_snapshot_20200514-1.16\forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar!\data\forge\tags\blocks\ores\gold.json
{
"replace": false,
"values": [
"#minecraft:gold_ores"
]
}