You may need to either select the pertinent actor instance from the scene or from this dropdown:
Admittedly, I never fully understood watching values; half the time I feel like they either do not work properly or report nonsense. But that might be me. Over the years, from what I’ve gathered, the general consensus is they’re often unreliable… 
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I have the same issue, in this case, I need to watch a map.
thank you very much
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