I just found at least 2 young random Birch trees (probably spawned from the same, untouched parent tree) which randomly have the “Harvest Resource” and “Remove as Target” Options available, yet no “Delete”.
Clicking on “Remove as Target” does nothing, but adds the “Delete” option.
Also, if I put a road next to the tree - not actually requiring its removal - workers arrive to chop it down, whether I clicked the “Remove as Target” or not. Clicking “Remove as Target” in this situation actually works, but the “Prioritized” Checkbox keeps being active and cannot be disabled, even if the chopping down and the road are both cancelled.