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I've updated my instance's security groups, which are the same for both the instance and the SSRS option group.

Pulumi updated the optiongroup first, which puts the instance in state _Modifying_.

Then it tries to update the security groups on the instance, but RDS only allows that when the instance is in state _Available_.

Once it finishes modifying the SSRS security groups, I'll re-up and I expect it to work fine.

Yep. It has finished, I re-upped, it worked fine.

Interestingly, updating the instance's SGs never put the instance in _Modifying_, so it would have worked fine the other way around...

Was it replacing a SG? Modifying should have no impact to RDS (IE adding a new allow statement etc)