So the output of 'localectl' correctly says
VC Keymap: de-nodeadkeys
but 'dumpkeys' disagrees. That sounds like the 'loadkeys' part (which *should*
be called by 'localed' via the 'localectl' command) failed.
Please check if you can explicitly load that keyboard layout:
loadkeys de
(should give you q w e r t z)
loadkeys us
(should give you q w e r t y)