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Summer 19 release causing issue with Lightning Event parameters?

I'm aware that the Summer 19 release has caused an issue with parameters in URL's so they need to be prefixed with the default c__ name space.
Is this issue also effecting lightning events? As the event below has stopped working due to the contractId parameter being undefined?
I have tried prefxing the parameter name with c__ but that hasn't worked.
navigateToPlan : function(component, event) {

        var contractId = event.target.attributes.getNamedItem("data-contractid").value;

        var navigateEvent = $A.get("e.force:navigateToComponent");
            componentDef : 'c:ContractPage',
            componentAttributes: { contractId : contractId }