I wasn't able to reproduce the failure locally after 30 repetitions, on both Chrome and Firefox. Looking at the video recording my guess is that the problems comes from a timing issue, where the test doesn't properly wait for local changes to be propagated. ChainPad provides a way to wait for local changes to be pushed, but this guarantees the changes reached the server, not the other users. To bulletproof this, I'm editing the same page in a separate / temporary tab and wait for the changes to arrive there.
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