Fire Emblem - The Sacred Stone went into blank screen after select retreat.

[tvcat]

Bug report: fire-emblem-sacred-stone.zip

I opened the game and load state then select retreat from the in-game menu and the display area went into blank, no sound and does not response to input. It is supposed to show the game saving screen. I think the game is still running as I can see there is CPU usage and the FPS counter is running.

I tried using the saved game then select retreat and the game run correctly to show me the game saving screen.

What could be the issue here?

Edit: This happened for 2 times now.