Blame says there's a potential issue with huge redwood trees

[pm065]

I have no idea what this means, but Blame says there's something wrong with the huge redwood trees:

[16:22:48] [Netty Local Client IO #0/ERROR] [co.te.bl.Blame/]:
****************** Blame Report 1.16.5-3.0.2-forge ******************

Failed to load resource file: minecraft:worldgen/configured_feature/seagrass_deep_cold.json

Reason stated: Unknown element: ResourceKey

Possibly helpful hint (hopefully): If this is a worldgen JSON file, check out slicedlime's example datapack
for worldgen to find what's off about the JSON: https://t.co/cm3pJcAHcy?amp=1

Prettified form of the broken JSON:
[
minecraft: worldgen/configured_feature / cozyconiferous: huge_redwood
]; Unknown element: ResourceKey[
minecraft: worldgen/configured_feature / cozyconiferous: huge_redwood
]

This error is repeated many times, except in each one a different non-CC feature is listed in the bolded italic bit. Is this a problem that should be fixed?

[OrderedChaos-Dev]

Weird, I'll check it out