TV Window - Alt+F4 issue

[Dreamer]

To reproduce:
- switch DD to TV Window mode
- press Alt+F4 to exit DD
= TV Window is closed, but audio is ON, DD is still running in Task manager, Details tab only, it's impossible to exit DD the other way as end task in Task manager

Alt+F4 in standard window mode and fullscreen works good.
Exit via context menu item "Exit" in TV window mode works good too.

DVB Dream v3.7.1, Windows 10 1909.