Ah! That’s a really clear bug report and yes, that does reproduce it for me too (@dreev!). Steps like that are really helpful, because it really makes it clear what exactly is going wrong. I don’t think anybody’s mentioned actual steps to reproduce it before. 
Even just “here’s what I was doing when it happened” really helps; I’ve tried a few things before to get it to reproduce, but deleting a datapoint without having refreshed the page was just not something that occurred to me… though it might have done if someone had said “I entered a datapoint and then immediately went to delete it”, for example.
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