Add warning about adding feature with multiple biome modifiers to best practices
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* Avoid using biome modifiers to add vanilla placed features to biomes, as this may cause a feature cycle violation (the game will crash if two biomes have the same two features in their feature lists but in different orders). Placed features can be referenced in biome jsons or added via biome modifiers, but should not be used in both.
* Avoid using biome modifiers to add vanilla placed features to biomes, as this may cause a feature cycle violation (the game will crash if two biomes have the same two features in their feature lists but in different orders). Placed features can be referenced in biome jsons or added via biome modifiers, but should not be used in both.
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* Avoid adding the same placed feature with more than one biome modifier, as this can cause feature cycle violations.