No rows returned when filtering by a shared text field with relationships

This is one of the more bizarre bugs that I've seen with Views- I'll describe it as best I can and would really appreciate if anyone could offer help.

Basically, I have two content types (ct_plus_project and ct_plus_task) that both have a selectable text field (field_ct_plus_status). One of the content types (ct_plus_task) can reference the other (ct_plus_project) via a nodererence field (field_ct_plus_project).

I want to view all tasks whose status is 'Open' and whose referenced project's status is also 'Open'. Sounds simple enough, right? Create a relationship for field_ct_plus_project, then add two filters on field_ct_plus_status, and assign one the relationship.

Here's the bizarre part: if you select 'Open' for both status filters, no tasks are returned (even though most tasks and their parent projects are Open)! However, if you select multiple values for the task status filter, you do get all of the appropriate tasks returned.

Here's the query in the case where you just select Open for both filters:

SELECT node.nid AS nid,
   node.title AS node_title
 FROM node node 
 LEFT JOIN content_type_ct_plus_task node_data_field_ct_plus_project ON node.vid = node_data_field_ct_plus_project.vid
 INNER JOIN node node_node_data_field_ct_plus_project ON node_data_field_ct_plus_project.field_ct_plus_project_nid = node_node_data_field_ct_plus_project.nid
 INNER JOIN content_field_ct_plus_status node_data_field_ct_plus_status ON node.vid = node_data_field_ct_plus_status.vid
 LEFT JOIN content_field_ct_plus_status node_node_data_field_ct_plus_project_node_data_field_ct_plus_status ON node_node_data_field_ct_plus_project.vid = node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.vid AND node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.field_ct_plus_status_value != 'Open'
 WHERE (node.type in ('ct_plus_task')) AND (node_data_field_ct_plus_status.field_ct_plus_status_value = 'Open') AND (node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.field_ct_plus_status_value = 'Open')

I suspect that field_ct_plus_status_value != 'Open' on the left join is what's preventing any results.

If I select both 'Open' and 'Resolved', I get the following query, which seems to mostly work:

SELECT node.nid AS nid,
   node.title AS node_title
 FROM node node 
 LEFT JOIN content_type_ct_plus_task node_data_field_ct_plus_project ON node.vid = node_data_field_ct_plus_project.vid
 INNER JOIN node node_node_data_field_ct_plus_project ON node_data_field_ct_plus_project.field_ct_plus_project_nid = node_node_data_field_ct_plus_project.nid
 INNER JOIN content_field_ct_plus_status node_data_field_ct_plus_status ON node.vid = node_data_field_ct_plus_status.vid
 LEFT JOIN content_field_ct_plus_status node_node_data_field_ct_plus_project_node_data_field_ct_plus_status ON node_node_data_field_ct_plus_project.vid = node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.vid AND node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.field_ct_plus_status_value != 'Resolved'
 WHERE (node.type in ('ct_plus_task')) AND (node_data_field_ct_plus_status.field_ct_plus_status_value IN ('Open', 'Resolved')) AND (node_node_data_field_ct_plus_project_node_data_field_ct_plus_status.field_ct_plus_status_value = 'Open')

Notice that now the Left join condition is on field_ct_plus_status_value != 'Resolved'

If you would like to see the offending View or reproduce this yourself, download this feature and check out the ct_plus_tasks view. But the example query here is simpler and still produces the bug.