In some conditions the world may render with gaps between chunks.
Steps to reproduce:
1. Create superflat world with preset minecraft:bedrock,64*minecraft:deepslate,5*minecraft:stone,5*minecraft:dirt,5*minecraft:gravel,90*minecraft:water,minecraft:ice,minecraft:water;minecraft:deep_ocean
2. Fly around in creative
3. You should notice visual glitches when crossing chunk borders.
Note: Increasing your render distance to lower your frame rate might make the issue more noticeable (because the frame containing the bug stays on screen longer)
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[Mod] Jingy
This is MC-239701, see 'Shotcut_00_00_04_209.png' in said issue (the same long line across the ice can be seen). The only difference with this issue, is that you're putting water above it, which doesn't change much of the result other than the color.
Ceresjanin123
Incorrect resolution, this is definitely a different issue. MC-239701 causes a false hole to appear at chunk coordinate 15/X/15 (south east corner) after a block update (for example after breaking a block) and only on a specific chunk builder setting.
This however happens on every chunk builder setting and no block updates are required (happens on any chunk border after crossing)
violine1101
This looks more like MC-38022 to me, does that match better?
Ceresjanin123
@unknown I don't think so. MC-38022 is about translucency breaking at certain angles/distance. This has something to do with crossing chunk borders. They may be related but I'm not sure, someone with technical knowledge would need to investigate.
I just did a deep dive into MC-38022 to determine what it's about and there's very little chance it's the same issue.