DIRECTOR: Mylk (Windows) [D4] is not completable

[Thunderforge]

In the Windows version of Mylk (​available on Internet Archive; the game was originally distributed as freeware), you can get trapped pretty early on

1. After the game starts up, click the gray door
2. Click again to enter the viewer room
3. Click the back arrow

Nothing happens. The expected behavior is that the user returns to the previous screen.

Every time the button is pressed, scummvm.log receives this event:

[2021-08-23 12:50:07] WARNING: Movie MYLK does not exist!

Versions

• ScummVM x64 2021-08-23 (g8812574dc8)
• macOS 11.5.2

[sev-]

Windows Mylk is a Director 4 game, we do not expect it to run well yet.

[rvanlaar]

The movie 'MYLK' is MYLK.exe. ScummVM currently doesn't handle loading a .exe file when the game is already running.

[rvanlaar]

Noted, what's needed:

• detect the MYLK.exe as a valid movie name
• be able to load projector files when switching movies.

[tag2015]

Tested now with latest master, the game is playable, but not completable.

I can play until ​this point, then when the author's picture appears, there's no way to continue.
On the console the following message is shown:

WARNING: Tried to thaw when there's no frozen play state, ignoring!