Can no longer filter "week" column

I use the “week” column to prioritize. I had a view set up that would filter tasks based on the “week” column, but now the filter seems to have disappeared. I no longer have a way to filter based on the “week” column, and am now limited to using dates, which is not what I wanted.

I like the week column because I choose the dates based on what I have going on in a week. It’s how I prioritize. Why has this column been removed from the filter options? How else can I see my tasks in a week that don’t yet have a specific date associated with them?