Some of these may have been covered individually....
Post world generation - mountains continue to form, primarily in unexplored chunks. What was even more freaky was that 2 chunks way from my new base (unexplored) was a Pillage Outpost, now there is a huge mountain. I have even dug through the new mountain to see if the outpost might have still existed inside, not so.
This may also include complete change of terrain and biome, leaving leaves and part of trees hanging in midair.
Water and lave pillars randomly generating in midair, at random heights. Including in explored chunks and in the same active game. Was exploring/mining down at -55, came back up to the surface and these things are everywhere.
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