Commit
974887c85b72149df1b759f462ce12cdc774beba
by alexbegtRemove @SideOnly(Side.CLIENT) from getSubBlocks as it is no longer only
a client side method.
(https://github.com/SlimeKnights/Mantle/issues/103)
https://github.com/MinecraftForge/MinecraftForge/commit/368d206cc6b85d16270dffa723f9f0d0b2e96e06