extended_sight_radius shows up enemy units on the minimap without actually extending the unit's sight radius. You have to enable the extended sight using a modifier first on the EBP or SBP before it's active.
I suspect search_radius is the radius enemies have to be within before the SBP reacts to them on their own. Try lowering it to less than the unit's sight radius and see if enemies that come within sight (but not within search) are reacted to?
Thanks for the answer!!!
So, extended_sight_radius aply only for the minimap.
I have infantry squad with outer_radius 60 and search_radius 35 and react instantly when they see an enemy at 60 range.