Clipped webpage forever in "loading..." state

[ept]

I pressed the "Clip to Capstone" button on this URL: http://www.vldb.org/2019/?important-dates on Chrome on desktop, and saw the scaled-down webpage correctly show up in Capstone on that computer. However, on the Pixelbook (having previously been connected to the same workspace URL), the shelf displays only a white rectangle containing the text "Loading...". I have tried this with a few different webpages, and it doesn't always happen, but does seem to happen reasonably frequently. It seems to be accompanied by the following exception in the console:

ClientPeer.ts:58 protocol.onerror ED-Hr Error: Remote timed out
    at d._ontimeout (index.js:453)
    at d.i (events.js:165)
    at d.r.emit (events.js:78)
    at d._kick (index.js:196)
    at index.js:96
a.on.e @ ClientPeer.ts:58

protocol.onerror %s
a.on.e | @ | worker.js:8