Document should warn about the observer-effect in debugging

[chi-mf]

In Outlook Classic on Windows, if you do what the document days to enable debugging in registry, the underlying script engine will be V8 (Program Files\Microsoft Office\root\Office16\v8jsi.dll), without debugging enabled, the engine will be Chakra (Windows\System32\Chakra.dll), this leads to the observer-effect: when you observe it, problem disappears, then you're not, it comes back.