Stuck Notes on VSTi when using on screen keyboard

If playing a VSTi with on screen keyboard you can get stuck notes by moving the VSTi editor window and releasing the keys prior to release.

It appears the MIDI events from key release are not being received while the UI is being dragged.

Expected behavior - Midi events to be passed through still.
Acceptable behavior - clear input on movement (panic button)

  1. Open a VSTi (I used HALion Sonic SE in ‘safe mode’)
  2. Open the Instrument Editor
  3. Alt+K to get screen keyboard
  4. Press and hold any note on the PC keyboard to sound a note via the onscreen keyboard.
  5. Grab the UI window for the instrument to move it using the menu bar and left mouse button, do not release left mouse button yet.
  6. Release the held not on your keyboard
  7. Release your left mouse button.

This will result in a stuck note until you press and release it again via pc keyboard, VSTi input or GUI keyboard.

I do not currently have my USB/Midi keyboard to see if this happens with a “real” piano keyboard.

Windows 10 x64 (up to date)
Cubase 12.0.3
CPU Intel(R) Core™ i9-10900KF CPU @ 3.70GHz 3.70 GHz
Asio Audio Device - SoundDevices Mix Pre 6 v2
32 GB ram

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