I’m modelling a multi‑stage textile system. When I run the LCIA for the full product system, the contribution tree shows repeated nested loops of the same foreground stages (P7→P1 appearing multiple times). The model graph looks correct and I don’t see any circular links in the inputs/outputs.A second issue is that T1 (a transportation stage), which is correctly set as the provider for P1, does not appear anywhere in the product system contribution tree. However, it does appear when I run a direct LCIA on P1 alone.Is this looping behaviour normal for openLCA’s contribution analysis? And why would a transport stage appear in direct LCIA but disappear in the product system LCIA?
