Werk #12502: Rare bug during parsing for clustered custom plugins

This werk only affects users that have certain custom plugins developed against the old check API in a clustered setup.

Specificly: This affects you, if you have

• a custom check plugin
• using the *_item_state features in the parse function
• in a clustered service setup

In this case, you probably observed crashes of the parse function or stale services (we have never observed this theoretical bug). This will be fixed. However: If this actually affected you, you should consider moving all item_state related logic into the check function (as this will be enforced by the new API).

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