A studente can't submit an assignment if "students submit in groups", use marking workflow and use marking allocation are enabled together

I'm using a fresh installation of Moodle 3.1.5, then I create a new course  and a new assignment with

• Students submit in groups = YES
• Use marking workflow = YES
• Use marking allocation = YES

There is a course group.

There is only a student enrolled in the course and does'nt matter if it's also enrolled in a group. No groupings are defined at course level.

Loggin into moodle directly as the student, the assignment fails with the error page "You can't add comments"

and this is the stack trace:
Debug info:
Error code: nopermissiontocomment
× Stack trace: * line 58 of /mod/assign/submission/comments/lib.php: comment_exception thrown

• line ? of unknownfile: call to assignsubmission_comments_comment_validate()
• line 7564 of /lib/moodlelib.php: call to call_user_func_array()
• line 7546 of /lib/moodlelib.php: call to component_callback()
• line 947 of /comment/lib.php: call to plugin_callback()
• line 958 of /comment/lib.php: call to comment->validate()
• line 440 of /comment/lib.php: call to comment->can_view()
• line 74 of /mod/assign/submission/comments/locallib.php: call to comment->output()
• line 1146 of /mod/assign/renderer.php: call to assign_submission_comments->view_summary()
• line 319 of /lib/outputrenderers.php: call to mod_assign_renderer->render_assign_submission_plugin_submission()
• line 901 of /mod/assign/renderer.php: call to plugin_renderer_base->render()
• line 319 of /lib/outputrenderers.php: call to mod_assign_renderer->render_assign_submission_status()
• line 4657 of /mod/assign/locallib.php: call to plugin_renderer_base->render()
• line 4908 of /mod/assign/locallib.php: call to assign->view_student_summary()
• line 594 of /mod/assign/locallib.php: call to assign->view_submission_page()
• line 52 of /mod/assign/view.php: call to assign->view()
  And the error page is missing the css information, so only text is printed (maybe because is a unexpected error)

Disabling the "use marking allocation" feature, the assignment it's available again to students.

I'm not sure that enabling these assignment options does make any sense, but a teacher can do that and then does not understand why the assignment is broken.

The relevant code is in mod/assign/locallib.php in the function list_participants where an additional join is added to the sql query that get the list of students that can do submissions.