[VST] Notes are not retriggered correctly during playback and note input

VST Bug

I report three issues which I believe pertain to the same kind of behaviour for VSTs:

Playback is not triggered at all in two cases: (a) if it is stopped and restarted at the same position, and (b) if the playback cursor is located on a tied note. See the video below (at the end, incidentally, you will notice that there is a weird playback artifact on the third staff that uses Muse Sounds): https://github.com/musescore/MuseScore/assets/120221700/7c86df37-e667-41b4-ba65-29165d011bf0
Playback and note-input preview are not correctly retriggered (that is, notes are not triggered from the beginning) if playback was stopped abruptly. Instead, the new sounds are superimposed on the end of the sound that was stopped suddenly. This is conspicuous for sustained sounds, as shown in the video below, but it is likely to happen for short sounds too (to back up this point, see point 3. below). https://github.com/musescore/MuseScore/assets/120221700/dafe89d4-4742-4058-9de4-2b32b1da5389
In the latter case, the last played note is not shown as released on VST interfaces (apparently, the information that playback was stopped is not sent to the VST user interface). https://github.com/musescore/MuseScore/assets/120221700/d26c8254-2d9a-4add-96ba-1b4352bae5d2 (4. In long scores, playback is not triggered for the first note of any bar: this issue is known as #22638)

See above

No response

Tested on latest 4.4 master and 4.3. Probably not a regression in MS4.

I don't know

Win10 (22H2); RAM: 16Go; CPU: Intel Core i5-9300H (2.40GHz)

Tested on different sounds in DecentSampler and Spitfire Audio LABS.

musescore / MuseScore