Finder Sidebar Icons messed up in latest Grasshopper Open Document Window Dialogue!

[diff-arch]

Hi,

I’ve noticed that in the latest version of Rhino 6 for macOS, the icons in the sidebar of the Open Document window are sometimes displaying incorrectly:

The problem seems to be Grasshopper only. The Rhino dialogue is fine!

Here’s how it should look:

I’m currently using macOS 10.14.6 (Mojave) and Rhino 6 (6.22.20028.13212, 2020-01-28).