Thomassé's 8-edge-connected antisymmetric 5-flow conjecture

Let $\vec{G}$ be a directed graph. An antisymmetric $B$-flow is a $B$-flow in which no two arcs receive inverse elements of $B$; in particular, it is nowhere-zero when $0=-0$. Thomassé's conjecture. Every directed $8$-edge-connected graph has a $\mathbb{Z}_5$-antisymmetric flow. The source presents this as an open conjecture, motivated by the dual relationship with homomorphisms of planar graphs and by the existence of directed $7$-edge-connected graphs without a $\mathbb{Z}_5$-antisymmetric flow.