Remember? Everything animatable?
Apparently that’s also true for changing materials during render.
It’s somewhat expected and certainly something I consider a feature and not a bug as it’s probably a good way to preview materials on the fly. Others might see it as bug though.
Just look what happened to my nice little (try on a volumetrc) flame ball
- all I did was changing the ramp during the render. The pink came from accidentally turning the ramp off.
I think, if you did this with multiple materials/textures and a higher number of render tiles than I used here (I used the default 8x8 and 2 threads), this could turn out to be a new interactive and abstract artform - and a nice way to put the rendertime to some (silly) use