The Bug:

Observing frozen lakes and rivers near trees, extruding cliffs, and other terrain that covers the lake/river from the sky at any level will disable the generation of ice in the top layer of the body of water.

Expected Behavior:

Frozen lakes should almost always be completely covered up by ice on the top layer of the body of water, unless they are exposed to a different biome of warmer terrain.

Observed Behavior:

Frozen lakes do not generate ice when other naturally generating blocks are placed in a way that covers parts of the lake from the sky.

Steps to reproduce:

• World Seed: -6100112833322447643
• Observed location of the bug:
  • X54 Y79 Z352
  • X20 Y79 Z337
  • X120 Y81 Z198
  • and many more.

UPDATE 11/30/2021 7:10PM KST - added labels "generation" "terrain_generation" "generation-bug" "world-generation"