Werk #12304: Fix case where passive checks would remain "passive" until a core restart

Component Core & Setup
Title Fix case where passive checks would remain "passive" until a core restart
Date Aug 2, 2021
Checkmk Editon Checkmk Enterprise (CEE)
Checkmk Version 2.1.0i1 2.0.0p9
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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