it happens to me quite often every single day.
I harvest any plant (like flax) and it disappears from sight & map (like it usually does after harvesting).
But it doesnt give me any item. I have to press F again to collect items (on the ground). Even though i have everything regarded to auto-collect or aoe-collect etc.
Idk how it triggers in my cases ,but i found another way to trigger it, if it may help.
If doing like the "Jackal-Teleport" over an plant and managing to F-Harvest in the right moment , while having the Mount-Teleport end a bit mor fare away, the plant gets harvested but not collected.