I wonder if there is a better place to discuss this, as it has nothing to do with the bug at hand. Some people get emailed each time a comment is made on this post and it can get annoying.
@ProfMobius
#2 does indeed seem to be fixed, not able to reproduce.
Jumping up into the portal from below which previously sent you into the void every time, now takes you to the platform as intended.
Thank You!
I've noticed on our server if you jump up into the end portal from below it places you at the wrong coordinates 95% of the time where if you jump from the top it's more like 50% Try jumping up from the bottom to recreate.
I have also encountered this bug.
However a few odd things to note, I was not affected by this bug until 16w04a when my sounds and subtitles suddenly stopped working. It has since been in every snapshot since. I decided to go back and check 16w03a, a version not previously affected for me, but the sounds and subtitles are now no longer working in that snapshot either. I've gone back to test, the earliest snapshot that is affected by this bug is 15w43c (I'm guessing actually 15w43b, when subtitles were added, but I can't select that in the launcher).
Every version before subtitles were added works perfectly, including 1.8.
Evidence in 1.9 pre-release 3 http://gfycat.com/FabulousHandyKite and http://gfycat.com/AdolescentSoulfulAmericanbittern