teleportation problem by used autoclicker in severs

The bug

When you use an autoclicker while you're in the nether portal, you can also be teleported to the coordinates present（In servers）

How to reproduce

1.Join a minecraft server（survive）

2.Go to the nether portal and use an autoclicker(You can use tweakeroo:fast left cick)

3.It has a probability teleportation

4.If you are't teleportation，try it again

5.The x.y.z. is nether portal's site

notice

You only can reproguce it on the nether portal you created.

It can't use on generative nether portal

And 

You can view the relevant videos here：https://www.bilibili.com/video/av329511844

Please forgive me for my poor English.