I have the same problem as someone who posted 120 days or so ago,
a simple setup, I want a manager gameobject to evaluate which Portal object is closest to the player (Portals are no prefabs in my setup, player is). It does not work with Find closest when looking for a tag.
Find-closest-object-in-List works properly, but Find closest (Tag) always returns None(GameObject).
I also tried the Manager as owner to look compared to itself, but it also returns empty.
To me it looks as if Find closest is simply not working.
Can somebody confirm this?