Hello. First off, I would like to say that I realize that these issues have been reported or commented about at least once, and that you ask that there only be one issue per report. However, all these issues have one variable in common and I therefore believe that all three of these issues may be linked to a root error. Thus I have made this separate report for you to label duplicate or otherwise deal with as you wish.

World Type: Old World

Current Bedrock Version: 1.16.100 / 1.16.101

Common Variable: The last 16 blocks leading up to the Southern and Easter edges of the world (Further referred to as the "Error Edge Zone")

Problem #1: When inside the Error Edge Zone, you cannot hear any sounds that the character usually makes when walking. To my knowledge, this is the case regardless of any block you walk on. ALSO: When the character jumps, the sound that will play is the sound effect for jumping on most stone types, regardless of what the actual block type is (wood, wool, plant, etc.)

Problem #2: If the player enters a block of water within the Error Edge Zone, whether it be source block or flowing water, they will not be able to exit onto land, unless the block they are attempting to jump on is outside the Error Edge Zone. They can still swim, bob, break blocks, etc. The only way for them to exit while inside the Error Edge Zone is to dig a trench into the land and then cut off any flowing water behind them, so that the block they are standing in becomes air. (Barring they can fly or use teleport commands)

Problem #3: If there is a body of water that falls within the Error Edge Zone, any and all marine life (salmon, cod, exotic fish, turtles, squids, dolphins) that attempt to swim into it will seem to pop out of existence (I assume they despawn, but I could be wrong). They disappear as if invisible and make no sounds. Interestingly, marine animals spawned via spawn egg outside the Error Edge Zone that swim into it will also disappear, BUT if they are spawned INSIDE the Error Edge Zone they can swim in and out of it without appearing to be affected at all. Drowned are not affected by this issue in any known capacity.

None of the above issues occur within the Northern or Western edges of the world, except where they form a corner with the Southern or Eastern edge.

_Note: I have tested for these same issues on an iPhone 7 running iOS v. 14.2 with Bedrock installed (v 1.16.101), and all but Problem #3 seem to be exactly the same. On the phone, Problem #3 does not appear to occur. I am not sure if this is because the Hotfix fixed that issue or if it means that Problem #3 is specific to my or other devices. _

I will try to attach pictures or video clips later to show this off. These errors should be reproducible in any newly generated old world.

Thank you for your time.