Found the Issue, the check if the pipe can fill a fluid into something else always did it with 1L of Fluid, which a Mold would not accept ofcourse…
This Version should probably be working for you. ^^
(note 1: The scary sounding Description is only there to make sure people don’t use that Version lightly.)
(note 2: if you use this Version more often, make sure your Browser didn’t cache the Download)