When after an upgrade, 
  /usr/lib/module-init-tools/regenerate-initrd-posttrans 
runs 
  dracut -f --kver "$kver"
the generated initrd goes to
  /boot/efi/<somehexid>/$kver/initrd
which looks right but is in fact incorrect because
  /boot/efi/loader/entries/<somehexid>-$kver.conf
actually uses 
  initrd     /<somehexid>/$kver/initrd-$kver

Note the trailing "-$kver".

So, after running dracut, there are two initrds:
  /boot/efi/<somehexid>/$kver/initrd
  /boot/efi/<somehexid>/$kver/initrd-$kver
of which the former is the new one but ignored and the latter is an older one
which will still be used.