Back in TSW1 days, a few years ago, Matt P said DTG were preparing a patch to enable the correct (leafless) winter trees in winter. Do we know what happened to it? Eg. Set a winter preset in the game - the trees have leaves on them. However if you enter a Winter seasonal date in the UE4 unlocker console using SetLocalDateTime you get trees without leaves. Unfortunately changing the date in this way breaks the timetable, so we could do with a proper fix so that winter presets provide the correct seasonal foliage.
I also think it is a problem as the trees look terrible in the snow as they look so unreal i hope they sort it out ,mind you they have had that problem for ages its just another fix to sort out. Gary