Network Information works fine on raspberry-pi with stretch Release:
Raspbian GNU/Linux 9.9 (stretch)
4.19.42-v7+ #1219 SMP Tue May 14 21:20:58 BST 2019 armv7
But it don't work on buster!
Raspbian GNU/Linux buster/sid
4.19.42-v7+ #1219 SMP Tue May 14 21:20:58 BST 2019 armv7l
Also tried the fix Profile - bgx - Pi-hole Userspace
by deleting /etc/pihole/pihole-FTL.db followed by pihole -r
But it doesn't helped unfortunately.
Any hints are verry welcome