Curiously, was looking at the Nardo Ring area (even NASA has a page it). Having the CycleOsm layer active a whole maze appeared in zoom 15 (300m) of the unusual. Moving around it looked like it was a single quadrant of a tile/tiles. As it is a very low mapping activity area mapped a few landuse plots there. Took a little but after a while and Ctrl+F5 that tile/tiles got refreshed too in the CycleOSM layer.