Could you please confirm if the PP patch inside GameData\SETIrebalance is or is not responsible for this? + the following two posts.   Edit: All the PP patches inside that folder GameData\SETIrebalance\0ProceduralParts\ don't check for MFT or RealFuels. So for example in SETI-PartMod-PP-TankLiquid.cfg it's @PART[proceduralTankLiquid]:NEEDS[ProceduralParts]:AFTER[ProceduralParts] but how about @PART[proceduralTankLiquid]:NEEDS[ProceduralParts&!ModularFuelT
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