I have my Waybar started through a systemctl process, so I'm not too sure how I'm going to pipe output into logs, especially with the worry that it might generate a logfile that's way too large. These are my coredumps though.

waybar-coredumps.txt

I do read a failure to pull IPC socket even if socket exists, and it receives events actively, so it might just be an initial listener race condition. I think the IPC issue is unrelated.