I may have found a solution - at least for my particular configuration. I was running on a HIDPI screen with Gnome & Wayland. I had set the Gnome window scaling factor to 2 previously, but now I have the scaling factor set to 0 to let Wayland autoscale and I no longer have issues with the menu.
[0122/110114.748152:ERROR:gl_context_glx.cc(239)] Couldn't make context current with X drawable. [0122/110114.748217:ERROR:gles2_cmd_decoder.cc(4330)] GLES2DecoderImpl: Context lost during MakeCurrent.