Tree Trunks Showing up With stone(Default Custom Trees)

the generator seem to work beautifully. how ever when trying to add backwards client support using protocolsupport some of the trees trunks show as stone. while under 1.13 the trees look fine. but under earlier versions such as 1.12 they are not. have tested the protocolsupport with out epic world generation and all the trees are fine that i have found.