Years ago, I choose to provide as single version only version >= default distribution version. So 7.3, 7.4 and 8.0 for F31, 7.4 and 8.0 for F32+
When Software Collections (SCL) were created, allowing multiple versions, I choose to also provide older versions, so 5.6 to 8.0 for F31+
So, indeed, you have to use the SCL for 7.3 on F32+
For FPM you only have ...
This is a Fedora bug which affects at least Fedora 31 and 32 (#1879450).
Note that the ps man page you are quoting from is outdated - current ps versions directly read the symbolic wchan information from /proc/$pid/wchan.
Looking at the stack walking procedure it seems that it simply doesn't work without frame pointers. CONFIG_SCHED_OMIT_FRAME_POINTER isn'...
The answer to my question is:-
firewall-cmd --direct --add-rule ipv4 filter INPUT 10 -i ens192 -p udp -m udp --dport 53 -m string --hex-string "|0A|peacecorps|03|gov|" --algo bm -j DROP
The answer was found at https://github.com/firewalld/firewalld/issues/527
For visibility, the link on the comment by @Jakuje solved it for me.
Reset the MTU size to 576:
ifconfig eth0 mtu 576
Doing it only on the host running the ssh server worked for me, but the link suggests doing it on both server and client.