Have a tamed wolf
Hold lead in a hand
Right-click the wolf to leash him
Push the wolf through a nether portal
Wolf vanishes along with the lead
Go through the nether portal
What I expect: the wolf is on the other side of the portal with the lead close by or in my inventory
What actually happens: the wolf is on the other side of the portal, but the lead vanishes.
Cannot reproduce. I tested this, and the lead just reappears on the other side of the portal (in the nether).