[Bug 58649] New: SimpleTV portable (Qt5/Lua/VLC) – D3D9Ex OSD overlay disappears or crashes after opening dialogs

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58649

Bug ID: 58649
           Summary: SimpleTV portable (Qt5/Lua/VLC) – D3D9Ex OSD overlay
                    disappears or crashes after opening dialogs
           Product: Wine
           Version: 10.14
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: d3d
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Application tested: SimpleTV (portable fork, Qt5/Lua/VLC)
Official download: https://plst.rf.gd/?i=1

Problem: OSD overlay (D3D9Ex child window) disappears or crashes after opening
dialogs, depending on backend.

Wayland/Xwayland → OSD appears but glitches. Dialogs do not kill it
immediately, but resizing the window often makes it vanish. Sometimes restored
by “Always on top”.
    Wine Virtual Desktop → OSD stable until "Options" dialog is opened. Then
disappears permanently (never comes back until restart).
    Xephyr (nested X11) → OSD stable until Options dialog. Opening it crashes
Wine completely.

Tested on Proton-GE 10-12/13/15 and Wine vanilla.
OS: KDE Neon (Ubuntu 22.04 base). GPU: Intel HD630 + Nvidia Quadro M620. DXVK
v2.7.x.

Expected: OSD overlay should persist after dialogs.
Actual: OSD disappears or Wine crashes.

This strongly suggests a Wine bug in handling of D3D9Ex child overlay windows.