[narwan]

If the first unit you ran into spotted you (as it did since it fired at you) you were spotted by all german units with a LOS to you. So there may have been units that spotted you but did not fire (out of range for example). If you then stayed in LOS all the time after your first encounter you will have stayed spotted all that time. Being in a tree hex (at edge of the woods) is NOT being out of LOS. You're in it. You can even be still in it if you're one hex deep in the woods.
After a first firefight make absolutely sure you then move the scout into a hex where NO enemy units, including ones you haven't spotted yet, can have a LOS on you.

Also, nine times out of ten the location of the enemy was determined by them firing at you. So it's not really unrealistic. Best way to use scouts in this role is to get them close to probable enemy locations (but not too close, 5 to 10 hexes should do) and put them somewhere with a good clear view (put weapons at range 1). Now move in with something else, if it gets fired on the scout will be in a position to have a good chance of spotting who's doing the firing.

If you're afraid of close range assaults or firing from close range put arty or lot's of area fire on the suspect hexes. It'll force the heads down of the enemy (pin or button them) which will reduce their hit chances and spotting.

Narwan