Loss of host - assignment rule to co-host

if the host's network or power/PC/software fails and there are multiple co-hosts appointed by the host, is there a zoom rule which  defines which co-host is automatically assigned as host?  We only want one specific co-host to be appointed.

one description said "host usually goes to the first assigned co-host"  - is this correct.  Others say its random - surely Zoom must have made a rule.