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Also, every 2nd `up`, an exception is thrown,
&gt; Error modifying DB Instance mydbid: InvalidParameterCombination: No modifications were requested

It's like preview knows there's a change, but `up` is sending the old values, maybe?

Ok resolved one of them, it was caused by subclassing aws.ec2.SecurityGroup, instead of pulumi.ComponentResource.

The other one is RDS' SQL Server MultiAZ property.. it's just always reporting that it has to go from false to true (which it does), but it never actually makes the change...

Sorted. pebcak. Forgot the "applyImmediately" property. So multiAz was accepted by the service, Pulumi thinks that it's true, but in fact, it won't be true for hours...