Werk #12302: Fix cache miss in SNMP discovery

Component	Checks & agents
Title	Fix cache miss in SNMP discovery
Date	Jun 10, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Here we fix cache misses for SNMP data where discovery would miss entries.

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