DORICO 4, its MIXER and PLAY mode

  1. I have activated these options

  2. the example I gave behaves as shown in all n/4 metres,

  3. Sibelius does not see any notation problem here (attached pic)
    Screen Shot 2022-07-02 at 14.12.14

  4. this whole discussion misses the most important point, playback.

The notation subject is interesting, but I will willingly skip it when the music is correctly played. The root problem is the two tied quavers with staccato articulation are NOT played as staccato, but automatically turn into natural. This happens when the length of the note crosses over the beat line.
And that is the bug.
Witold