Please make all entries required: false. For example, letsdoaddon-structures\tags\worldgen\biome\has_structure\mangrove_hut.json:

{
  "replace": false,
  "values": [
    "#bloomingnature:mangrove_swamp"
  ]
}

Has to be:

{
  "replace": false,
  "values": [
        {
            "id": "#bloomingnature:mangrove_swamp",
            "required": false
        }
  ]
}

And so on. There's a lot of error log spam that can be avoided and keep our client/server output clean.

That was actually intentional, to avoid structures generating if the required biome wasn't found, but I'll do that, thanks for the report :p