I'm also having this issue, with 2 of my allay specifically. Even when I've broken the portal and with no other lit portal in my world, they'll still teleport to the Nether somehow. I've also found their broken leads in the Nether portal rather than around the fencepost I hitched them to, if that helps at all.
I'm also having this issue, with 2 of my allay specifically. Even when I've broken the portal and with no other lit portal in my world, they'll still teleport to the Nether somehow. I've also found their broken leads in the Nether portal rather than around the fencepost I hitched them to, if that helps at all.