Some rare biome "Oceans" occupy a chunk in the plains.(Need to open the debug screen)

the 3 report

Put the summary of the bug you're having here

This loophole looks a bit wrong, and I notice the grass cube texture

I was transported at a distance from the birth point, where a loophole occurred. But there will be no sea in the plain.

What I expected to happen was...:

There will be no "sudden" flaw in a straw cube material. There is no beach here.

What actually happened was...:

In the 1 chunk, this is a "sea", and I have seen no sand "beach" groups near the edge of the map, and there is a light green grass block.

Steps to Reproduce:

1.Put a step by step guide on how to trigger the bug here

2.Create the world, select the seed -831438243221475643

3.please loading world 

4.When the load is finished, please use command: X:-7046 Y:82 Z:-4771 ( /tp -7046 82 -4771 or /tp @p -7046 82 -4771)

5.Look at the grass square below

6.opened show debugscreen

The following can be tried (this is to open the debug screen)

7.open chunkedge (F3+N),then run edge nearby(please inside),then go to chunk outside

(more accurate steps) 8.Move towards the X:-4783.999(ocean biome)of the block boundary and then go to X:-4784.000 (ocean biome) and then to X:-4784.001(Plains biome) (try teleport command)

Summary: This loophole is rarely noticed, because the loophole is relatively rare and needs to be seen in the distance to see the grass cube (I have 8 screenshots as attachments)

Look at it after you see it MC-132234