Standby instance does not start anymore after upgrading to Oak 1.8.25


After upgrading to Oak 1.8.25, AEM instances starting in standby mode throw an IllegalArgumentException.

21.01.2022 18:07:25.073 *ERROR* FelixStartLevel org.apache.jackrabbit.oak-segment-tar bundle org.apache.jackrabbit.oak-segment-tar:1.8.25 (107) : The activate method has thrown an exception (java.lang.IllegalArgumentException: Unexpected mode property, got 'standby')
java.lang.IllegalArgumentException: Unexpected mode property, got 'standby'
    at org.apache.jackrabbit.oak-segment-tar:1.8.25


The issue has been reported to Jackrabbit Oak:

Do not upgrade your Cold Standby instances to Oak 1.8.25

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