When you have a slicer which is a Drop Down & the Search window turned the Eraser to remove the filter will remove the filters applied via check boxes, however, The Search window is not cleared.
Thus, if you had text in the search window it remains even after the filter has been "erased."
This creates confusion with users, because sometimes it is not obvious that the Search Window still has text, which is filtering down the selection of items. Thus, sometimes users think something is wrong because there are items missing even though they have pressed the eraser to remove all filters from the slicer.
See Idea: https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/32919691-slicer-eraser-should-cle...