com.google.gson.JsonSyntaxException: Expected item to be an item, was unknown string 'malum_runewood_sapling'
It's quite annoying when trying to examine the log
https://hastebin.com/osekemefix.properties

Have you reported it to FarmingForBlockHeads too? It's their mod that spams the log, even if it references a Malum item. The issue could be on either sides.

The issue was on my side, it's been fixed in indev.