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EDIT: The mod is treecapacitator - where can I insert the IDs of the modded leaves so that trees added by mods like Dye Trees will break the same as vanilla trees?
I know the Apple Oak Sapling 13384 <Unknown genome> from Forestry doesn't decay instantly, it seems to decay like normal. I haven't checked any others as that was the only odd sapling I had. Rubber Trees (MFR) are instant however.