Automatically closed - issue fixed for 2 weeks with no activity.
workbench_menu_access_alter_menu_link_forms() uses $access_result instanceof AccessResultReasonInterface without correctly specifying the namespace of the AccessResultReasonInterface.
Browse to a menu form where the exception is triggered.
The exception never contains a reason.
The full class path should be specified.
I will submit a patch.
Fixed
1.3
Code
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Automatically closed - issue fixed for 2 weeks with no activity.