Filter referenced item without losing other content
As what I understand your needs its very simple.

You have to set the filter criteria in the views:


Add Content Type A
Add Content Type B
Add Published field twice
Add Date Field and set its criteria as you already set
The field (Entity Reference field in Type B) that reference to Type A and set its operator as Is not empty (NOT NULL)
Now, Open re-arrange the filter criteria fields



 7. You need to Create new filter group under the filter criteria and drag drop your fields in required group like below



I hope this will at least give you an idea how to filter different content types with different field(s).

Thanks