Error when trying to add a view from template

Problem/Motivation

When trying to add a view from template (admin/structure/views/template/list), the following error occurs:

The website encountered an unexpected error. Try again later.

AssertionError: assert($group_relationship_type instanceof GroupRelationshipTypeInterface) in assert() (line 92 of modules/contrib/group/src/Entity/Storage/GroupRelationshipStorage.php)

Steps to reproduce

Visit the /admin/structure/views/template/list page, or click on "Add view from template" on the main Views admin page.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes