Show items not linked by a view relationship I have two content types: Item and Order.

There is a link from Order -> Item through field_items.

I have a view showing content of type Item and any related order data in a table. I have set up a non-required relationship to Content using field_items to reference the Items.

I have a filter on the view to ensure that the content type on this relationship = Order. This is because I have another content type which is not shown on this view that uses field_items.

The view functions largely as required. However, it only shows Items that are linked to an order via field_items whereas I would also like it to show items for which this link doesn't yet exist.

I have tried adding a second condition for content type on the relationship is EMPTY and putting the two filters into a filter group with the OR operator. However, when I do this, nothing shows up in the view.

How do I get the view to show all Items (linked or not) with linked Order data where this exists?
This looks like the answer:

https://www.drupal.org/project/drupal/issues/2744777

There is a known bug in Drupal 8 whereby filter groups in views are not saved. The two filters (content type is empty and content type) Order are being AND-ed rather than OR-ed so therefore nothing is displayed as content type cannot both be empty and = Order.