Though not a solution to the bug, a workaround is to open Onboard click the 'arrow' button which is above the enter key to get some new keys related to clicking, select the 'right-leaning arrow' key and then click on the spot where you want a right-click to happen.
Though not a solution to the bug, a workaround is to open Onboard click the 'arrow' button which is above the enter key to get some new keys related to clicking, select the 'right-leaning arrow' key and then click on the spot where you want a right-click to happen.