gateway ends up in a empty world / End not loading

Can confirm.
Note that teleporting with the /tp command does generate the world, so it is the Gateway causing problems and not slow computers.

I have also experienced this issue. I am able to reliable replicate by either A) stepping into one gateway that teleports a reasonable distance away then stepping into another that teleports back. or B) using creative mode's flight to fly to the further gateway and stepping into it.

I have also experienced the same issue when using ender pearls to enter the naturally spawned versions in the end. Usually when attempting to return to the central island on my way back to the over world.

When I press F3 I note that the Y coordinate fluctuates rapidly whilst remaining around the same value the whole time.

Upon further testing it appears to only affect a specific pair of end_gateway blocks in the same chunk as each other. But not another 4 I've been using to test at 2 other locations.

I don't know if the new fixes to do with chunks are the cause, but this seems to be fixed. I'll do some more testing in a new world/new gateway (I tried the one I already have)

This problem still exists in snapshot 15w35b with the additional issue that now when I reconnect the client to resolve the issue I end up with chunk rendering issues (See screen shot 2015-08-25_14.24.25.png for example) that can only be resolved by restarting the client entirely.

To clarify, the initial issue of the world not rendering still exists, the temporary "fix" of reconnecting the client to resolve it now results in a further rendering issue.

As of snapshot 15w39c I am no longer able to replicate this issue using the exact same world and end_gateway blocks as before.

Closing then. Harmjan Haisma, let us know if the issue occurs again.