Currently, DTTFC makes TFC's Arborist advancement (obtain all 19 non-fruit saplings, in TerraFirmaCraft World) unobtainable, because TFC's original saplings are unobtainable with DTTFC's seeds having different item IDs. If practical, DTTFC should change the advancement (or recommend a datapack to downloaders) to require the new seeds, not the saplings which DTTFC removes.