missing video in transition with sdl2 viewer

[bremner]

I have a playlist of two producers. This first is just a png file, and the second is an mkv video blended with a png, using frei0r.cairoblend. If I use an avfile consumer, it works fine, but if I use the sdl2 consumer I get only audio from the mkv (or at least that's what it looks like). If I swap the order of the consumers in the playlist, it works in the SDL consumer as well. I will attach the test case.

test-case.zip