was playing minecraft bedrock edition, cross playing between ps4 and xbox1, had 6 tamed parrots, pushed two through, other player then went through, they made it through, then pushed the other four through while the other player was loading the over-world portal, the last 4 parrots did not appear on the other side, and seemingly disappeared, no death messages were given for them, I'm sorry if this isn't enough information, but its as much as i can give to hopefully re-create the bug to find the cause of it, we looked thouroghly to see if another portal had spawned somewhere, but there was none to be found