Custom blocks or/and Biomes from many cool addons has disappeared and can no longer be found in the creative menu. Some can only be found via /commands which can be annoying and frustrating. Even some builds with custom blocks are half gone due to 1.16 not generating this. If you can fix this bug that would be very appreciated. Though if this was intentional us players don't like this. As for custom biomes they no longer generate as they used to.