yes, there are certain triggers which will still expose you. you must be aware of them
going through tall grass/foliage
dropping off an object
getting too close to barrels, fences and other items
in addition, running incog will do more than just take you off thermals and remove a name over your head. it will also prevent enemies from doing callouts when they see you. callouts are great in this game and when people dont run incog, you can listen for them and know where the player is since the callout has a very good descriptor.
having that in mind, avoid those things.