[Bug 55963] New: Regressions in 8.19-8.21 - VSTs crash when removed from use

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55963

Bug ID: 55963
           Summary: Regressions in 8.19-8.21 - VSTs crash when removed
                    from use
           Product: Wine
           Version: 8.21
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

This issue was found when testing fix for
https://bugs.winehq.org/show_bug.cgi?id=55812

I do not know exact wine version where this issue appeared, but it's between
8.19 and 8.21

When using bitwig with the following plugin (free demo available):

https://www.arturia.com/products/software-instruments/acid-v/overview

Removing the demo Acid-V VST from a bitwig track (eg. delete/backspace) wine
will crash with the message dialog.

"A program on your system has crashed, but WineDbg was unable to attach to the
process to obtain a backtrace."

Also when closing a bitwitg project with multiple VSTs (which appear to work
okay) all of them/most of them will crash in same way, producing numerous
previously mentioned crash dialogs.