This has been posted on github/issues but it gets ignored. Simply, when TerrainControl is enabled, new maps generate random orange and grey pixels. Disabling it leads to normal effects.
This happens with default configuration and Biome Bundle.
I'm running terrain control 2.8.2 on 1.11.2 (the plugin is renamed to tc282.jar)
Biome Bundle/Default Config
Issue happens with and without other plugins.