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Please note only reboot with failover results in the scenario that you have explained. And you are correct that the parameter group might not have been updated for multi-AZ instances when you invoke a reboot with failover. For reboot without failover, both the primary and secondary DB instances reboot, and parameters are updated after the reboot. Perhaps this is what you have done, and hence see the parameter group applied to primary. In any case, what I would recommend is, for applying the parameter group change for a multi-AZ RDS, always reboot without failover.
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