test scenario :
have two hosts, each with one ipmi item. verify that both work. disable item on one of those hosts.
observe how server (openipmi lib, probably) still connects to this host.
probably same happens if host is disabled, is in nodata maintenance and maybe some other scenario (like is deleted ?).
it does not seem to be reproducible with one ipmi host only - there must be another, even though they are not related.