Entities from overworld teleported to end

When I typed

/tp @e Doctor5555

in the end entities from the overworld and from the end were teleported to me, including a named dog. This did not happen when I went to the nether and tried the same thing.

 

Steps to reproduce:

1: spawn a recognisable entity next to an end portal

2: go to the end

3: teleport @e to yourself