I am still seeing this on a Mac mini on 10.15.5. All of the workarounds mentioned here and elsewehre (disabling and re-enabling extensions; close all windows, move dialog to center of screen, to edges to screen; re-boot to Safe Mode with Shift; and any combination thereof ...) do not work for me. I even did a fresh install on a spare disk and the bug is still there. This is just hilarious. Isn't there a way to hack the extension to be enabled by editing some configuration file and/or using a Terminal command?