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MCPE-229028

Top or bottom faces of blocks in caves frequently fail to render, creating horizontal lines when exploring caves

Summary:
Top or bottom faces of blocks in caves frequently fail to render, creating horizontal lines when exploring caves. Please note that this is different from MCPE-229027, as the Anti-Aliasing setting does not impact these lines, and changing the time of day alters the color of these lines, confirming that the issue is caused by missing or unrendered block faces. These lines are also visibly thicker. This bug had not always been present, however, I am unsure of which Minecraft update introduced it.

Steps to Reproduce:

  1. Use the following seed: 1558083136

  2. Teleport to the following coordinates: /tp 4639 -2 -2102 facing 4600 -3 -2075

  3. Jump repeatedly.

  4. Change the time of day using /time set day or /time set midnight to see how the color of the lines changes.

Observed Results:
The top or bottom faces of certain blocks in caves will randomly but frequently fail to render, producing visible horizontal lines. Changing the time of day alters the color of these lines, confirming that the issue is caused by missing or unrendered block faces rather than graphical artifacts.

When combined with MCPE-229027, cave exploration becomes very visually distracting due to constant flickering and flashing lines appearing throughout the caves.

Expected Results:
All block faces should render consistently, and no horizontal lines should appear when exploring caves or moving the player camera.

Video Showcase:

The video has been uploaded to an external website, as the bug tracker is failing to upload attachments.

https://i.imgur.com/Ncr26k9.mp4

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Lisa Su

(Unassigned)

Unconfirmed

Windows

Windows 11

1.21.111

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