Bedrock Edition: Editing at Y = -63 causes chunk sections to be deleted (16×16 void holes)

When modifying blocks at Y = -63 (near the bottom of the world), chunk sections can become corrupted and are saved as air. After reloading the area, entire 16×16 chunk-aligned sections at Y = -64 are missing, creating permanent void holes.

Steps to Reproduce:

1. Go to Y = -63 in any world Modify blocks (placing/removing, or loading structures)

2. Leave the area so chunks unload Return to the area

3. Observe missing 16×16 chunk sections at Y = -64

Expected Result:

Bedrock layer remains intact

Actual Result:

Entire chunk sections are deleted and replaced with air Additional Notes: Occurs in multiple worlds

Not using addons or texture packs, Holes are always 16×16 and chunk-aligned, Gravity blocks fall into the void, Issue does not occur at Y = -62 or higher

HOW YOU DO IT: make sure your render distance is a maximum of 9 chunks. go to a location in a world, then dig down to y=-63 and place a structure block, then go into the structure block and save a structure that is 64x40x64 blocks (Must be all air), then name it something like “air”. Then place structures at offsets (0,0) (64,0) (64,64) (0,64) (-64,64) (-64,0) (-64,-64) (0,-64) and (64,-64). Now you should have a 3x3 grid. We need a 5x5 at minimum, so do offsets (128,0) (128,64) (128,128) (64,128) (0,128) (-64,128) (-128,128) (-128,64) (-128,0) (-128,-64) (-128,-128) (-64,-128) (0,-128) (64,-128) (128,-128) and (128,-64). Then look around the entire room (this may take a few times) around the edges, because the holes usually form around the edges. There should be at least one 16x16 chunk aligned hole there in the bedrock at y=-64, opening up the void.

Note: if you do this at y=-62 or higher, it will not work.