When applying a contact sheet filter (e.g. the colour classes) makes you lose your selected filter settings.
Steps:
1. Build a filter, selecting a number of criteria in one or more categories.
2. Deselect one of the colour classes in the contact sheet colour class filter (buttons on top right of the contact sheet) and apply this filter (arrows button).
3. Depending on how many categories you had chosen, you already immediately see one or more of the filter criteria disappear as selected.
4. Moving your mouse of the still marked as selected criteria, removes the marking of those too though.
Required outcome: set up filter criteria should not be lost when applying contact sheet filters.
Note: This issue is likely related to
Tag/Rating/Colour filters should be applied directly to catalog sheet