Spotting, Recon and Intel

[Mowgli]

I find illumination rather difficult to understand.

E.g. in the WWI scenario "Picking the Pear" (1918-Hamel-01), if I have my Aussies fire a starshell, then german units in ground mode in hexes with trenches in non-clear terrain stay concealed (can be identified by using the sniper's binos). Those in trenches with clear terrain become fully visible (trenches by themselves do not provide any additonal concealment!).

By contrast, the starshell immediately reveals my own concealed Aussie units (ground mode in 1m brushes, fire on hold, no movement, outside the ordinary 3 hexes visibility range) to the Germans. So it seems as if illumination rounds in this scneario completely lift the concealment of the Aussies, while that of the Germans stays active?

I've also tested it the other way round, with the Germans firing the star shells.