Front panel frozen from the inside

Hello, have a problem with our Leon 5F BJ 2016. For 3 days now, where it is a little colder, the windshield freezes from the inside. It is a real ice layer on it in the morning, where small pieces of ice fall on the amaturating board and water beads run down the disc. Already last year and in the autumn it was observed that small water drops on the top of the disc, mostly around the mirror region small drips However, the workshop did it with moisture in the car. Dangers the car becomes daily 2x30km, climate always runs along. Bringing away and fetching the two kids stand on the way back morning and evening due to the strap-on of the kids the doors also longer open so that also the moister warm air can out. In the car is also always a dehumidifier, rubber floor mats are used which are dry and the designed newspaper under the mats / in the footroom is also absolutely troc I couldn’t see any water break-in. I don’t type on moisture in the car like the workshop, there should be several or all the windows covered / icy or ? It only affects the windshield, the others don’t even run on. Also hang some pictures, the one just at defrost and the other around prime condition, there is also to see that all other windows are clear. As already mentioned fog don’t even the other windows, even when I took the photo the inside and squatted in the car for a few minutes. Maybe one or the other has an idea what it might be about or what I could change in my ventilation behavior??? Workshop does not stir a finger dran because supposedly only moisture is inside. VG Stefan