I have just updated to V5 Beta 5 and am able to recreate this
The reference entry box is blue when I click into it and begin entering a reference; however, when just enough reference is entered to update the middle preview pane, the preview section is updated, the reference entry box turns white, and focus is set to “Use Individual Settings” in the bottom section of the preview pane.
(Thank you and God bless you for all your work you have done on this.)