Don’t ask me about such old versions! Was there even a manager-context in MODx Evolution?
Yeah, you’re right!
It seems that in MODX versions before 3.1.0, the context key was displayed in the window (where “Access Permissions” are added). Now the context name is displayed instead. So probably the check should be updated to not check the value of the display itself (but to check if a context key was selected).