Those elusive bugs, which get triggered by some usage pattern that you, the developer, never seem to exhibit.
Who uses multiple browser windows? Are tabs not good enough for you?
And of course, the actual fix turns out to be a one-liner.
In this case, I was lucky that my debugging routine included testing in Private Browsing, which happens to also be a new window. How on earth I would have reproduced the bug otherwise, I have no idea. How do 10x engineers deal with that?
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