Hello,
This was an issue that I wanted to address since the deep underground was released, but didn't because I thought Other people already addressed it.
Whenever I convert and enter the old world in 1.18, a bug would happen where it creates a hollow "pillar" underground that would reach the void. This is an issue because it's possible for the players to fall to their death.
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https://drive.google.com/file/d/10kFyFxI1qf54ApldVFbM7KwZ7iLSNCDp/view?usp=sharing
Since the file is too big, here's the link to google drive. it's a different world, but it has a similar bug.
An update, this seems to happen when I start the game on a really old chunk. (I started this world in alpha version) I started the world on an updated chunk (1.0) and the bug didn't happen.
Please give us a download of the pre-upgrade world.