We have one user who cannot see his courses on his dashboard's Course Overview (myoverview) block. HIs courses show up fine in the navigation tree and he can access them fine.
Both when he accesses his dashboard or when we login as him an error appears, "Invalid Response, Invalid Response Value Detected" and no courses are displayed in the block.
Turning debugging on shows now additional info.
Moodle 3.6.5+ (Build: 20190816)
If someone can tell me where the query is that is generating the course list I'll test that out. But I can't find anything in the plugin that suggests which query is run.