Addictive Keys VST - No sound at all if MS was closed while VST was used in the mixer

[CroustitBat]

Issue type

VST bug

Bug description

I (only) used Addictive Keys from XLN in the mixer, but if I leave MS while keeping the VST in the mixer, all the sounds are grayed out in the mixer

Steps to reproduce

1. Select a VST in the mixer (and save)
2. Leave MuseScore
3. When back on the file, all sounds are grayed out in the mixer

Screenshots/Screen recordings

MuseScore Version

4.3.2.241630831

Regression

I don't know

Operating system

Windows 11

Additional context

No response

[zacjansheski]

I haven't been able to reproduce this with my VSTs. We need licenses to test a third party VST.
Can you confirm this only happens with Addictive Keys from XLN ?

[CroustitBat]

I just tried with the BBC Symphony Orchestra VST and it seems to work fine, so Addictive Keys seems to be the problem