When a tree grows (appears) its leaves will break half slabs (tree leaves will replace them). Tree leaves usually test before appearing in an empty space, not will half slabs (transparent blocks?).
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Confirmed, leaves replace half slabs and walls and fences too.
Can't reproduce, what kind of tree are you planting?

Confirmed, attached a screenshot that shows how to reproduce

This also affects steps too.
They kept disappearing even though no leaves spawned in there place.
Had to redesign my arboretum to avoid this issue.
Will test 1.4.3 to confirm that its resolved