I believe #3815 introduced a regression where sometimes the camera view now ends up being 3D instead of 2D:

This only happens when live-streaming if you have previously deleted your blueprints.

rm ~/.local/share/rerun/blueprints/rerun_example_structure_from_motion.blueprint
python examples/python/structure_from_motion/main.py

Resetting the view after that fixes it -- I suspect we upset a tie-breaker.