possibly not a bug and just a design choice..
it looks like these were somewhat recently added:
# Added after migration to version [16]
Tab focus_next_ui_element
Shift-Tab focus_previous_ui_element
press c-f
press tab
though it works for jumping text-fields, as in search_in_project (c-s-f), i kinda expected it to work for search_in_buffer, to go to the next ui element, which are the little reg-ex/whole word/match case icons..
linux (with wayland override)