I cannot reproduce this issue on other worlds, but it continues on my survival world, which has been updated through several years of versions. I would be willing to send it, but it is too large.

I am trying to move armadillos through the nether, but they won't go through the portal. My wolf also will not go through the portal. The armadillo has been in and out of a boat multiple times, as well as leashed and unleashed, while the wolf has been sat and unsat a few times.

If it is relevant, this was on a self-hosted BDS server running 1.20.80.