There can be a custom solution to this. You can use a counter in JS to store the number of responses that have been received (After the survey page and before the end activity as depicted by Script 2 in the diagram below). You can store this count in a global variable (option) by using the setOption...

There was a bug in one of the client console's version in the 19.1 series. Can you use the client console of a recent build, such as 9228, and check?