Interstate75w

Hi everyone,
I need some help figuring out a problem coding in C++ using the interstate 75 and libraries provided for C/C++.
I bought a 64x64 led matrix panel and everything works great when using “PicoGraphics_PenRGB888” or “PicoGraphics_PenRGB565”. If I switch to “PicoGraphics_PenRGB332” nothing gets shown on screen.

The same happens not just with my specific code but even when compiling one of your examples in github: interstate75_fire_effect.cpp when replacing at line 31 “PicoGraphics_PenRGB888” with “PicoGraphics_PenRGB332”.
Is that not supported or just a bug in the library?