for the moment, let’s leave aside combined switches and add-ons – they only make things more complicated.
What I want to show here is that if you don’t define “staccato” in the EM but do use a staccato dot, your actual base technique will be default but the note will be shortened which is not what you want. Below is my solo strings EM with staccato defined and showing the tickbox where you can disable for testing and below it the score.
Then we have the Play windows showing what happens with first of all staccato enabled and then disabled.
As you can see, when the base switch named staccato is enabled then it will use that as base switch in the project. If you disable it in the EM then Dorico, when looking unsuccessfully for a switch staccato, will use the internal effect staccato – in other words it will shorten the note – but the actual patch will revert to default (in my case here is NoteLength = medium which is a long detache). The “internal effect” cannot be disabled as far as I’m aware but that doesn’t matter as it doesn’t materially affect playback if there is a different Base Switch.
Your illustration is more complex. Generally using two different switches like “sta” and “Fatk” together requires a combined entry in the EM unless one is an add-on switch as you have here. Your staccato + Ratk + ,sta short which doesn’t work — how is this combination defined exactly in the EM? Normally, it’s best to use add-on switches when they are on a different layer from the base switches - for instance when all instruments could be played “con sord” or “senza sord”. It may be your implementation is OK but again, we’d need to see the project.