Not able to select 4th grid container in devtools css grid inspector

Developer Tools
#1

46
2018-12-30 12.25.46.gif3360×1944 1.19 MB

I am able to select 3 grid containers but not more than that.
Is this a bug?

#2

This is a known limitation. Will be fixed soon. Can’t offer more info. Saw this on Twitter.