Wikis set to Teacher type using Visible groups should allow the teacher to create a wiki instance for each group. The visible group attribute should then allow all group members to see all of these wiki instances. This works as intended ONLY when the teacher creates a wiki entry for each group. If the teacher has not yet created a wiki for a group, let's say Group 2,, then Group 2 will be unable to read any of the other wiki entries. They will see the attached message when they visit this wiki activity. Once the teacher creates a wiki entry for their group then everything works as intended.
In this scenario, I expect all groups should be able to see all of the wikis a teacher has created for each group regardless if the teacher failed to create a wiki entry for every group.