It seems that in the latest beta branch the ‘Adjust Hue/Saturation’ command has stopped working completely. The dialog does not show, and you get locked out of using any tools or doing other commands, until you back out of the command, by using ESC.
This happens both when using
Edit > Adjustments > Hue/Saturation... and custom set keybinds.
Other adjustments do seem to work however.