Incorrect post placement update will be produced in specific situation when tree growing.

The situation triggers the incorrect update:

A log is placed in the block where the leaves are supposed to grow when saplings become trees.

The effect of this:

After Minecraft Java Edition 1.20.1, a post-placement update will be produced there and can be detected by observers. (Actually, the update seems to exist after 1.16, but until 1.19.4, the update cannot be detected by observers.)