Selected Wi-Fi network sometimes inaccurate

Reported by @AntonioBlancoGracia at https://github.com/elementary/wingpanel-indicator-network/issues/110#issuecomment-432420753

>Not sure if I should open a new issue, but alongside this behavior, I also find inconsistency between the network I am connected and the one that the wingpanel says I am connected, which is, by the way, unknown to me (see picture)
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I've occasionally seen this issue as well but am unsure how to reproduce it.

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