Events not dispatched for top-level annotations due to error

In the Adobe DC PDF View SDK, I'm experiencing an issue similar to this one in that top-level annotations of any kind will not be persisted. Commenting on particular parts of text will respond with that error, but no annotations besides replies will dispatch an ANNOTATION_ADDED event. ANNOTATION_COUNT does increase for text comments despite the error that displays.

I've isolated the failure - registering callbacks besides the following do not affect the presence of the error:

          previewFilePromise.then((adobeViewer) => {
            adobeViewer.getAnnotationManager().then((annotationManager) => {
              annotationManager.registerEventListener(function (event) {
                console.log(event.type, event.data)
              }, eventOptions)
            })
          })

 Here's the traceback, though it's cryptic due to the lack of sourcemaps:

Uncaught TypeError: t is undefined
    _validateMinLength https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validatePropertySource https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validateProperty https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validateObjectForKeyList https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validateObjectForKeyList https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validateObject https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validatePropertyTarget https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2
    _validateProperty https://documentcloud.adobe.com/view-sdk/2.15.0_2.1.0-45e9ffb/AdobeDCViewApp.js:2

I've attached the PDF I'm using for the benefit of testing.