Thanks @mitu!
I did these tests with just the default RetroPie 4.7.1, though I did sudo apt update; sudo apt upgrade to get all the latest packages.
Let me know if this information helps:
pi@retropie:~$ uname -a
Linux retropie 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux
pi@retropie:~$ lsb_release --all
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 10 (buster)
Release: 10
Codename: buster
- George