(Multiselect): A button must have "no interactive content descendant"

[dakahn]

When a user selects one or more items in our multiselect component they're presented with a button inside of a button in order to clear their selection:

Along with creating a host of accessibility errors/adding to potential screen reader and keyboard user confusion and frustration this violates W3C HTML5 spec 4.10.6 which states "there must be no interactive content descendant" for a button element.