Summary
Having a water body and replacing the water with lava by /fill can generate obsidian instead.
Steps to Reproduce:
If necessary, create a 3x3x3 hole in the ground.
Fill the hole with water (you may use
/fill ~~~ ~2~2~2 water
or similar).Fill the hole with lava using
/fill ~~~ ~2~2~2 lava
or similar.
Observed Results
The water is turned into obsidian, save for the corner block that is the highest and on the southeast of the obsidian cube.
From MCPE-103821 and further testing, if you use /fill ~~~ ~2~2~2 lava *0 replace water*
, the resulting cuboid will have a checkerboard/alternating water-obsidian pattern.
Expected Results
All the water should be turned into lava.
Linked issues
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Affects 1.19.22
This is also the behavior in Java Edition.