When lava pools generate in a forest or taiga biome, a nearby tree's leaves can become stone.
How to recreate: Find a taiga or forest biome, and a lava pool. if there is a close enough tree, some of the leaves become stone, granite, andesite or diorite.
this could be fixed if the lava pools were generated after trees, or if leaves were excluded from being replaceable blocks for the pools of lava.
Edit: provided seed, world specs and coords.
superflat specs: 2;7,59x1,3x3,2;5;decoration,lava_lake
coords: 337x,66y,442z
seed: -3735310115214278708
World is superflat, its hard to find a default world example. they do exist though.
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Confirmed.
Also confirmed to occur in default world generation, according to MC-56523
I'm not seeing anything unusual at the specified coordinates. No stone growing on trees. Played in 1.8-pre1.

I've discovered this in current release 1.16.2 (Also attached an image)
Seed: 5065972378046467357
Cords: 88 64 -668

New report please.

Created new Report MC-197942
Please provide seed and coordinates.