From what I understand, it just shows 'XXX' for speed in the Lane number (L1 etc), just like if it receives insufficient data due to a poor return etc, and no flash.
I think some operators are more savvy, and can flash you manually if they are awake !
I got flashed in an 80 zone once, already doing under PSL with a 4 sec auto-JTK, and still got flashed, so he could have been sus, and triggered manually. There is an option to 'photograph next car' for testing setup etc.
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