Seems a bug about camera render frequency

[zhw-github]

Hi:
Thanks for open-source this excellent work!

My Computer Environment is: Ubuntu22.04 GPU:4090D
I set the physics_dt = 1/100 and render_dt = 1/20
But it seems like no render image. But When I improve the render_dt to 1/60, have render image.

And if I use isaac office docum to set camera using omnigraph. It work, like:

Looking forward to your reply!