Conflicting group assignment status

If the submit button is enabled and "require all group members to submit" is NO, the behaviour should be as follows:
● student 1 creates the submission
● the submission is recorded against all members of the group
● all group members have a status of "draft (not yet submitted)"
● student 1 clicks submit
● all group members have a status of "submitted"

This working as expected in the screen:
/mod/assign/view.php?id=#

but not in:
/mod/assign/index.php?id=#

See attached screenshots

There are lots of other similar issues but they are all closed.