What's the issue you encountered?

When growing certain trees from saplings at y levels below y=0, the wrong behaviour is exhibited. Here are the examples I have found, but it might apply to some other saplings too. Also haven't tested with trees bigger than 1x1

Magic and Palm saplings: the bottom log block is not generated (air instead)

Fir saplings: the bottom log block is generated as dirt instead

Willow saplings: do not grow at all

How can the issue be reproduced?

To reproduce:

Create a new superflat world with the default preset (so the highest layer of the world is at y= -60)

Place a Magic (/ Palm / Fir / Willow) sapling down at y = -59 and use bonemeal to grow the tree. Incorrect tree growth is exhibited.

Place a dirt block above y=0 and repeat. Now the expected tree growth is exhibited.

Logs

No response

Mod Version

17.2.0.535

Additional information

No response