Restarting GNOME Shell sometimes results in transparent dock

[jacobgkau]

If I open the Applications menu, then restart GNOME Shell with Alt-F2, r, Enter, the dock loses its opaque background:

At this point, the Applications menu also loses its opaque background:

Restarting GNOME Shell again, logging out and back in, flipping the dock's settings on/off, and rebooting do not bring the background color back. I've had this happen once before, and the background color came back after an update.

[jacobgkau]

The dock background came back after I installed a few different versions of pop-gtk-theme while testing a PR, and is now not disappearing again when I restart GNOME Shell from the Applications menu, so that may not be the exact trigger.