When you click "Add member" on the Members tab, the action link contains a destination that will redirect the user back to the Members page. This is done by using the WithDestination plugin. However, this is not the case for other relationships.
You can easily instruct the action link to use that class with the following:
function MY_MODULE_menu_local_actions_alter(&$actions) {
$actions['my_action_id]['class'] = \Drupal\group\Plugin\Menu\LocalAction\WithDestination::class;
}
However, for entities that have bundles, the destination is not carried over in the links available on the next page where you select the relationship type.
Install and configure any of the following modules:
Notice that when you relate an existing entity to the group, you are directed to the relationship page.
Use the destination query parameter, if it exists, when creating the links on the page that the relationship type is selected.
Active
3.3
Code
I have created an MR. Note that in my tests this works for the pages provided by group_term and commerceg_product but not for gnode - the "Add existing content" button redirects back to the listing page instead of sending the user to the add page. That should be troubleshooted before this gets in.