Huge delay in ps output from systemd in Azure Linux

I'm getting huge a delay in ps output -- when it outputs the first line (systemd-networkd), there is a huge delay about **20** to **25** seconds, then the rest are displayed instantly.

$ ps -eaf
. . .
systemd+ 31865     1  0 Jul22 ?        00:00:10 /lib/systemd/systemd-networkd
62583    31891     1  0 Jul22 ?        00:00:12 /lib/systemd/systemd-timesyncd
root     31922     1  0 Jul22 ?        00:02:09 /lib/systemd/systemd-journald
. . .

Any idea why (and the fix)?

$ time ps -o uname -p 31891
USER
62583

real    0m25.025s
user    0m0.006s
sys     0m0.006s

$ time getent passwd 62583 | wc
      0       0       0

real    0m25.030s
user    0m0.005s
sys     0m0.001s

$ grep 62583 /etc/passwd | wc 
      0       0       0

$ grep passwd /etc/nsswitch.conf
passwd:         compat systemd

$ grep compat /etc/nsswitch.conf
passwd:         compat systemd
group:          compat systemd
shadow:         compat

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

$ uname -rm
5.4.0-1047-azure x86_64