Hello
> SAST [98628] LOG: listening on Unix socket
> "/u01/postgresql/.s.PGSQL.5437"
> Oct 29 10:59:59 zardplpsmasdev01 postmaster[98628]: 2019-10-29 10:59:59.505
> SAST [98628] LOG: listening on Unix socket "/tmp/.s.PGSQL.5437"
Seems you have modified unix_socket_directories setting. Your psql tries another path (also was changed from /tmp to /var/run/postgresql/ during compilation).
So this is not bug, just misconfiguration. Possible you want add /var/run/postgresql/ to unix_socket_directories
regards, Sergei