Can't color map again by an attribute after choosing to color by a different attribute

[e-t-k]

Within the past week or so I've noticed a problem when trying to switch between attributes of the same map: once you display an attribute and then leave it, you can no longer color by that attribute until you refresh the page.

EG, PancanAtlas/SampleMap: I view the map colored by "pan-kidney disease", then change to coloring by "LGG: Subtype". If I click on pan-kidney disease again to color the map by that attribute, the coloring doesn't change. If I switch to a new attribute, eg "diagnosis", that works fine, but now I can no longer color by either pan-kidney disease or LGG subtype.

• has happened on every map I have tried
• happens in Firefox and Chrome eg Chrome Version 67.0.3396.99 (Official Build) (64-bit)
• happened to @hbeale as well