How can i run with the product of manifolds

Hi teams, thank you for the quick support.
I am trying to run these models with the product of manifolds. For example, with HGCN, in the config.py, I used manifold with Product(Euclidean(), Stereographic()).
But it seems doesn't work and has a bug.
Did I do any wrong?
Thank you so much.

The report identifies config.py, HGCN, and Product(Euclidean(), Stereographic()) as the relevant setup. Begin by reproducing that configuration and capture the exact error, then compare it with the framework's manifold configuration expectations. Done means the cause and whether this product-manifold setup works are established.

Written by the indexing model from the issue text.