[Need Info] LOS Blocking Grass - Not Working?

[MantisHair]

As far as I can tell, the "Curtain" line of sight blockers are the tall grass things that hide small ground units (any of the 3 basic ground units, for example) that walk into them. Except those blockers aren't working for me, neither hiding units nor blocking lines of sight.
How do the bushes that conceal units work?

EDIT: It's not the blockers, they work like normal, it's my custom unit. This unit is seeing up cliffs and through "Curtain" LOS blockers (like an air unit), even though it's a ground unit. I created it from scratch, so maybe it's missing a setting that normal units have?
I can't find / don't know what that setting is.

Unit Flags - Use Line of Sight.

Figured this out about five minutes after posting that edit.

Can mark this as "Solved".

 

[Dr Super Good]

That will limit maximum sight range, it is still big but might not be as big as you want if you want to use very large line of sight. If you exceed the limit an error should be produced in game.