Acoustic feedback "hangs" in Key editor and score editor

When i’m in Score editor or the Key editor (MIDI) and have acoustic feedback on, whenever I select aan event I can hear the note playing,
but it never ends, just as if there is no note-off send to the VSTi. Only way to stop the sound is with MIDI reset command.

Whats happenig?

I never had this issue in Cubase 9.5.

Really nobody has this issue?.

It is now consistent in Cubase 10 in combination with Halion Sonic. Cubase 9.5 does not have the issue.
Any suggestion is welcome.