Yes, it is noteworthy, but it would be good to see some tests where the magnitude of the streaks is known. ie, are the streaks 10-stops below the bright part of the image? 20-stops? 30-stops?
If we knew that then it would be easier to know which situations you might encounter a problem and which you wouldn't.
This is the GH6 XYLA21 chart from CineD, and the curve from the brightest patch to the noise floor (the curve on its left) looks like it drops away into the noise floor pretty quickly, so I'd imagine that for the streaks to be visible above the noise floor maybe 1/4 of the width of the frame from the brightest areas (as in the image you showed) then the highlighted areas must be well above 13 stops or so above the flag. That seems obvious considering the flag is pretty dark and the windows are completely blown to hell, so who knows how bright they actually are.