Forestry version: 1.12.2-5.8.2.380
BuildCraft version: 7.99.20 to 7.99.21
Forge version: 1.12.2-14.23.5.2768
Link to crash report or log: https://pastebin.com/3SZT76gR
multiplayer: multiplayer
Steps to reproduce: Update buildcraft from 7.99.20 to 7.99.21
Additional information: ---

(Originally reported here: BuildCraft/BuildCraft#4326)

Sorry I should have looked before... but I changed buildcraft's API names from upper case BuildCraftAPI|transport to buildcraftapi_transport which breaks any @Optional() annotations on methods. (For example https://github.com/ForestryMC/ForestryMC/blob/mc-1.12/src/main/java/forestry/core/utils/InventoryUtil.java#L89).

(Sorry about this, I should have looked at #2340 before - as this is technically a duplicate of that one).