[BUG] mt7921e: Intermittent connection failure

[silverducks]

Greetings!

Update:
New version of the script is less consistent at reproducing the bug.
I've also noticed that on patched kernel it triggers timeout way
more often than older script. I've rolled back to the older one,
which relies on the NM autoconnect feature, though retained cleanup
changes.
I'm guessing direct nmcli command is often preventing NM from doing
whatever it is usually doing that triggers the error.
Script and reruns with it attached.
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