The operator used for the missing facet item is incorrect

+1 for RTBC

Adding a test for this

Fixed coding standards error in test.

The 2 failed tests are currently failing in the 2.0.x branch ( https://www.drupal.org/pift-ci-job/2658100 → ).

Comment #6 is still just test only addition from #2 which had no failures - I will try remember to come back and retest it assuming the tests in the main branch will get fixed some time soon.

I wonder, does the exclude facet option work with this condition?
I think it won't but I have not tested yet.

You are correct, this does break the exclude logic.

I think having the separate condition group for the missing condition is correct, and the missing condition group operator could be determined based on the exclude value.

How does that look?

Improved the test a bit to more clearly show the expected condition groups.

Moved patch to MR - CI shows test job passing + expected failure of the test only change