When you jump through the end portal it will spawn you on the edge of a platform or worse it will spawn you straight into the void with no chance of survival. This has happened so many times i avoid going to the end at all cost. 

Here's a link to a video of what happens

https://www.reddit.com/r/Minecraft/comments/mfrr9a/i_think_im_gonna_be_sickmojang_you_needa_fix_this/