Unfortunately, this is a consequence of the fact that only a few cards get 'special' treatment and the text for their triggered abilities contains variable information. Most cards (incl. Royal Carriage) gets a fixed text, so the text can't say for which Action it is.
It doesn matter often because you usually only have an Actioon 'going on' at a time. Golems, Throne Rooms and Avanto/Sauna chains are the problematic cases.