Argonal

I have this issue with the PC version. I use Natural and City and they both get the message shown above. Also, it appears that if the system level is using, e.g. City but the world level is not, this message will still appear and the world load will fail.

I have some additional information on this bug. If you ride a horse, donkey, or mule into the water and then put a lead on it and walk it out of the water, you will in most cases get the teleport situation upon remounting the animal. You may be able to free it from the lead and let it move on it's own for a while and avoid the teleport on remounting. 

HOWEVER, if, instead of riding it into the water and then attaching the rope to lead it out, you dismount on dry land, fasten the rope, lead it first into the water and then out again, and then remount, it appears that the teleport glitch never occurs.

I get the same behavior with mules. It probably occurrs with any ridable mob but this is not checked. 

The behavior appears correct if you have the autosave signal turned on and watch for it to save on land and then turn off before remounting. This should be verified by others and reported here to make sure.

Using Windows 10.

I believe that this is related to an issue that I see where I can't add to a stack of less than 64 arrows. Either when I try to get some from the ground, from a chest, or fabricate them, the operation just refuses. To get around this, shoot one arrow and then go retrieve it. Now you should be able to get or make arrows into the existing stack and if there are too many for one stack a second stack will start.

I have no idea what triggers this condition; it is not always there. Just every now and then the arrows seem to latch up.

There are several reports of similar conditions that I suspect are all the same problem, just seen from different viewpoints.

[Windows 10]

I have a world that I have been playing for a long time and the eye went to a blank spot. I dug clear to bedrock in a 9x9 area and found nothing. HOWEVER, when I used the seed to generate a new copy from scratch, an eye located the same spot, only this time it was in the middle of a village. I dug straight down to about level 40 and found the stronghold!

My assumption is that some fixes or updates to the code base move the stronghold locations but if you have previously explored in the changed location no stronghold can appear. This may not have happened with every update but it only has to happen once after your explorer has passed over the area.

I wish that people would stop mixing this issue with the one where a stronghold is lacking a portal. These problems are NOT the same and it just confuses the issue. 

You say that you are tracking this issue, but the ones you cite are "stronghold missing portal", not stronghold missing. I have a world that I have been playing for a long time and the eye went to a blank spot. I dug clear to bedrock in a 9x9 area and found nothing. HOWEVER, when I used the seed to generate a new copy from scratch, an eye located the same spot, only this time it was in the middle of a village. I dug straight down to about level 40 and found the stronghold!

My assumption is that some fixes or updates to the code base move the stronghold locations but if you have previously explored in the changed location no stronghold can appear. This may not have happened with every update but it only has to happen once after your explorer has passed over the area.

I also just noticed this. I have never had a bucket of fish, so I don't know what happens there, but it does NOT happen with either a water bucket or a lava bucket.

My biggest concern is what it might do to existing maps and map walls. I have several worlds that I'm reluctant to open because I fear that the maps will be "hashed". I can deal with either the 64 corner rule or a center map rule, but switching in existing worlds is an issue. If you are moving to a center map rule, please make it official; if not, please fix this.

This looks like a classic "memory leak". I have gotten this several times today. On shutting down and thin restarting Minecraft, and selecting my same world to play, it will start me up close to where I was when it failed. Several times I had been using a boat and upon restart found myself without the boat near and floundering in the water. I can then play for a while before getting the same error message.

Has happened again.

I've had the same result. It's possible that city textures were temporarily in this state also but now seems ok.

This sounds like a version of MCPE-24427

This also happens in Win 10. Playing Normal Survival in Winding River and others. Exploring in rowboat and encounter places where nothing loaded. Sometimes this is a new, unexplored area and sometimes I'm going back over my previous trail. I can recover by saving and then restarting the world.

Still happens in V1.0.9
To duplicate the effect:
If you enter the boat with a map in the ready line, if you view it without doing anything first the hands will be under the map. On the other hand, if in the boat you open and close inventory and then look at the map the hands will be on top. To get back, you need to exit the boat, open inventory and swap the map out and back in to ready, close inventory, and reenter the boat.
I seem to remember that the same effects happen if riding an animal.

Still happens in V1.0.0