Here is the exact sequence that this happened:
-pot trees from pine nuts
-procrastinate planting them after they sprout(maybe like a week?)
-plant them'
-trees not yet fully grown before I leave today
-come back a few hours later and they're done
-pick all the pine cones on main
-alt comes in to chop them down
-notice after a couple of trees that there are no stumps
-try chopping one on my main
-still no stump
I thought maybe they are invisible for some reason, and tried walking through the tree line, and theres nothing blocking me.