72.0.2 having same issue, aliadnan1984 workaround fixes it.
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getting the same issue in Developer Edition version 74.0b5.
Same problem, Nightly 77.0a1. Alidnan1984βs fix helps. Itβs annoying, though.
same problem in 76.0.1 (macbook) - unable to set breakpoints in externally loaded js code, page loaded when tools were open. I found closing & reopening dev tools fixed it (without having to reload the page)