isnt perception required for sensing im pretty sure they are one in the same if not linked.
edit: they are actually different.
I was using a pawn sensing component In blueprints fine…(it worked perfectly fine) then I only add an Ai perception component, only to see How it was…then I deleted it and then…The Pawn sensing just stopped working… It does not make sense at all I did absolutely nothing but create the “Ai perception” I placed some of its events (without messing with my blueprints) then I deleted the “AI perception” and deleted the events and compiled the blueprint… I changed absolutely nothing… And the “pawn sensing” just stopped sensing (I’m using it to sense noises). HELP ME PLS!!! 
I don’t know… the point is that it worked before and now it doesn’t…and it didn’t have an AI perception before.
THIS IS SO STRESSING …cause it’s not working and it should…I know It should work yet it doesn’t…
Ok, this is definitely a bug…cause it got fixed after restarting the editor for the second time… and without changing anything.
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Thanks