The most dangerous potential impact is people thinking it's a zebra crossing.
Lots of people discussing them do.
That's the sort of logic. Crossing = stripey. Flags = stripey. Let's put flag on a crossing.
Except only ZEBRA crossings are stripey. Light controlled crossings are NOT stripey because traffic is NOT required to stop for pedestrians.
But they've put these markings on the LIGHT controlled crossings (presumably because there's no specific rule saying they should be blank/plain).
There is a real risk of an impact here with someone trying to use a light-controlled crossing as if it was a zebra crossing, and crossing on red.