All Computers with Intel HD620 and Win 10 Update from 06/03/2020 have broken resolution.
The monitors have resolution 5120 x 1440 (Dell U4919DW) and they worked perfect for months.
With new Intel Display Driver Update from 06/03 the max choosable res is 3840*1080. We run this screens with one HP ProDesk and two Surface Book 2.
All Computers experience the same bug.
I will try to downgrade the driver tomorrow and report.