LMarbles from rapps, switching back from fullscreen by pressing 'f', hangs the application + logspam

Reproduction steps

• VBox 4.3.12 + VBEMP/VGAPNP + desktop resolution 800x600 32bpp
• Run LMarbles 1.0.6 from rapps.
• Navigate through the menu until you are 'ingame'
• Press the 'f' key on your keyboard to switch into fullscreen, this will still work and enable the fullscreen without the taskbar being visible even

But when you switch back from fullscreen, again by pressing 'f', the application will hang and an endless cascade of the following spam is logged

fixme:(dll/directx/wine/wined3d/surface.c:1496) Cannot find a conversion function from format WINED3DFMT_B8G8R8X8_UNORM to WINED3DFMT_B5G6R5_UNORM.

fixme:(dll/directx/wine/wined3d/surface.c:3358) Cannot convert WINED3DFMT_B8G8R8X8_UNORM to WINED3DFMT_B5G6R5_UNORM.

fixme:(dll/directx/wine/wined3d/cs.c:2077) Blit failed.

reactos-bootcd-0.4.16-dev-116-g1643793-x86-gcc-lin-dbg.webm
reactos-bootcd-0.4.16-dev-116-g1643793-x86-gcc-lin-dbg.log

I tested reactos-bootcd-0.4.16-dev-116-g1643793-x86-gcc-lin-dbg.iso
which is the DD-fullscreen-switcher-commit https://github.com/reactos/reactos/commit/16437937f7565f321d70bfbbc9844c77497e880e

I am not sure, whether this behaved better in the past or not. Haven't double-checked releases/0.4.14/0.4.14-release-124-g4962530 yet.