I use for Shadow of The Beast WHDLoad the option "uae-configuration … chipset ecs_denise" to remove the trashed tree sprite in parallax main menu.
When I run first a true AGA game like f.e. Virocop AGA WHDLoad and THEN I run Shadow of The Beast WHDLoad with "chipset ecs_denise" there is visible trashed gfx…
E.g. (Virocop AGA WHD and then Lionheart with "uae-configuration … chispet ecs_denise" to avoid line in the middle of the screen when scrolling up/down):
This in general happens whenever I run an AGA game first and then I force a game in ECS mode using "uae-configuration … chipset ecs_denise". Never happens if I run the game without "chipset ecs_denise".
Is this a bug in WinUAE 4.2.1 when switching chipset modes, WHDLoad, or simply expected behaviour due to dirty registers?