I tamed a laviathan but I can't get it though my portal. the portal itself (not the obsidian is about 7 blocks wide and 5 high and the laviathan is able to go through, but he can't enter it. I tried it while mounted and while dismounted, but it doesn't work

I do not have this issue even after testing it a lot. Is there a strider or something riding its back? Mounted entities usually can't tp, sometimes laviathan's steal entities from the lava's surface.

I found the problem, I forgot to enter the netherportal and so no mobs could enter ut