Yes similar issues in HU keyboard. (for the list separator ; I have to use Alt Gr too)
Generally the Alt Gr is like to press ( Alt + Ctrl ) together. (You can try it you should get the same character result in any Windows program)
I don’t think so. The only workaround to change your keyboard layout to e.g English (For me the “ő” & “ú” does the "[ "& “]” )
It is Incorrectly programmed and definitely a mistake or bug!