Inconsistent Issue Navigator behaviour of Column Renderings in relation to Custom Field Contexts

1. Create a custom field custom_field1 and expose it to issue types A, B; but not C,D
2. Create some issues of issue type A and C
3. Configure your issue navigator to show the column custom_field1
4. Select the Any value from the issue type list. Observe that custom_field1 does not appear.
5. Select issue type A only and observe custom_field1 appears
6. Multiple select A,B,C,D and notice custom_field1 appears
7. Select A and C and notice custom_field1 appears

The questionable behaviour is:

• Why does the behaviour change when selecting Any vs. the whole set of issue types (A,B,C,D) ?
• Why does the column show if selecting A and C?