So, after looking at the models data with a table, I’ve discovered that Combo is actually null wherever there was a count on Contact but not on leads. It was my visualization that was inserting/assuming the 0.
| Contact | Leads | Combo (UI-only on Contact Model) Unqualified | 23 | NULL | NULL Marketing | 104 | 21 | 125 Sales | 56 | 15 | 71 Won | 9 | NULL | NULL Lost | NULL | 2 | NULL
This is a far more understandable behavior, although I still think the desired behavior is that Model_Lookup merely returns a null whenever it does not find a row in the model and doesn’t invalidate the whole formula it is a part of.
