Currently, dashboards filters are very limited to use.
The most issues there that dashboards look like very similar to search filters but you cannot use them for “any” and “not” conditions.
For example, if in my Custom field about 20 values, in search filters I can set: any value grom this field. But in the dashboards I MUST select each of these 20 values. I somebody add 21st value - it will not be counted in this dashboard.
The same with “not” condition.
Please add these two very simple conditions to the dashborads. Or even better - make search filters and dashboards filters the same, because they are about the same things (filter tasks for selected filters).