Steinness conjecture for the non-archimedean collapse map

Let $\pi:{X}^{an}\to B$ be the continuous map from the analytic Calabi–Yau space to its limiting base constructed in the non-archimedean collapse picture. Steinness conjecture. The map $\pi$ is Stein. This is explicitly presented by the authors as a wish based on very limited evidence, and no general proof is given.