I have checked on ThingWorx version 9.2 and able to get serviceinvokecomplete. So is this specific service on which you are facing the issue or with every other Mashup?
If possible can you share the entities to reproduce the issue on my end?
If i called same thing more than one time serviceInvokeCompleted is not coming for any services. So Iam calling thing for one time only in mashup composer.
When you say same thing more than on time, then are you calling same service under same Thing_YourThingName section?? I would say you click on + icon and add YourThingName again so that you will have another Thing_YourThingName1 section there and do your stuff with new services under it. See if it resolves your issue.
