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Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Bit of a strange edge case - when I directly connect underground pipes to the factory, they don't connect to normal underground pipes.
Do you have squeak through?
Yup! Is that the problem?
Likely yes. I'll see if I can get this patched.
Try to update your mod. This issue was already fixed in version 1.1.15
:)