Sometimes they are just forgotten, not by purpose. In this case offering more information may (or may not) help as is hinted by “incomplete” status and Wayne’s comment. Unfortunately the developer resources are limited (and most of the developers are just volunteers, and even for CERN this is not a commercial product) so they can’t test every platform and combination themselves. Much is required from the reporters. In platform specific or other issues which depend on something to be reproducable you either have luck or not in whether it draws attention of a developer who can reproduce it or want to do deeper research to try to find the reason which they can’t confirm themselves.
About hotkeys/shortcuts - see e.g. https://firstname.lastname@example.org/msg31719.html, https://bugs.launchpad.net/kicad/+bug/1804326 and Various shortcuts don't work.