After move to async snmp poller i started getting random errors in items in hosts unavailable via icmp and snmp
for expamle:

SNMP OID: get[sysObjectID.0]

after several days or weeks i got

cannot read from session: Bad version specified (Sub-id not found: (top) -> ifLastChange)

But this host does not use oid "ifLastChange" anywhere

In another host (also not available via icmp and snmp) i got another error with same OID:

SNMP OID: get[sysObjectID.0]:
cannot read from session: Bad version specified (Sub-id not found: (top) -> ifHCInUcastPkts)

and also this host does not use oid "ifHCInUcastPkts" anywhere

ifLastChange and ifHCInUcastPkts exists in other hosts that have also been converted to asynс pollers.
There is probably a bug in async pollers and/or buffer with incorrect indexes between items differents hosts.
This happens when polling through via server and proxy.