Zwift in DEX mode

I have a Galaxy S9+ and I’m facing a strange behavior running Zwift in DEX mode. When enclosed in a windows, the clickable areas in the app are displaced upwards by the size of the windows bar.

Going to full screen (which is the same as maximize in DEX), the displacement disappears.

I wrote a message to Zwift support but, after almost 2 weeks, the attendant answered with nothing useful. He doesn’t even know what DEX is. So, forget about solutions by Zwift in the near future.

Does anybody faced this behavior, found what causes it and how to avoid?