@Jay I have been noticing that this bug will appear in one pane on a board but not in another pane on another board with the same view, filter and zoom level. I found a weird but now 100% reproducible pattern that may be helpful to figuring this out.
If I launch the app into, or switch to, a board that has an Email pane as the last pane on the board, OR I add an Email pane as the last pane on a board, and then I add an include-priority filter to any Outline pane already on the board, all items are excluded in that Outline pane, even if they match the priority filter.
If I add any other type of pane as the last pane and then add the priority filter in an Outline pane, the filter works properly.
Reordering the panes does not have an effect on the bug until I switch to another board and back, or restart the app.
If the priority filter is already set in an Outline view when switching to or launching the app into a board or adding an Email pane, the filter works. The bug only occurs when adding the priority filter to an Outline pane when an Email pane is the last pane.
Can anyone else reproduce this?