Popup in Module Builder - 7.9.10


I’ve just upgraded to 7.9.10 and the popup in module builder is still not able to be dismissed (see the attached screenshot).

It has a z-index of 2, using firefox to change this to 3 brings it on top and allows it to be dismissed.

The z-index appears to come from the element itself rather than css, I can find anywhere to change this?