Device: Mac 10.12.3
Browser: Chrome 73.0.3683.103
Target: at.js 1.7.1
Target Activity: uses Conversion goal measured by Click of Element (set within Goals & Settings)
Problem: With active test on click of selected element, Chrome blocks response (CORB)
Cross-Origin Read Blocking (CORB) blocked cross-origin response https://mboxedge17.tt.omtrdc.net/m2/crocs/mbox/json?mbox=clicked-btn-x&mboxSession=b1268b31051b407ea... with MIME type application/json. See https://www.chromestatus.com/feature/5629709824032768 for more details.
NOTE: I see the same issue when using getOffer/applyOffer.
Chrome's CORB algorithm seems to be fickle. For some reason it doesn't block a JSON response when I use the getOffer method, which is practically the same thing as the JSON response when using the Measure by click element.