This is a chunk rendering error I haven't seen happen before the 1.13 snapshots. It happens consistently in the debug world (see MC-125653), but seeing it in isolation allows one to examine its effects better and proves that debug world fuckery isn't the only culprit for this issue.
A chunk doesn't render. If you are on the same x/z chunk coordinate as that chunk, chunks behind it (relative to the player) don't render. If you are inside the chunk, behavior might be slightly different (depending on camera angle), but I now realize I didn't test sufficiently while recording the video. F3+A typically fixes the issue.
See attached video for a short demonstration.
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Does reloading the debug world fix it for you? I only tried F3+A on the sandstone world and reloading the debug world.
F3 + A doesn't seem to fix this issue in the debug world.