Overlay plugins not displayed in streamed images

[Simonmaignan]

Hi @lucasw

Me again :)
I have another question/limitation that I don't understand.

Some of the RViz plugins of my rviz configuration are not displayed in the streamed image.
I double check and their "Visibility" is activated in the CameraPub rviz config class.

I noticed that the non rendered plugins have in common (and are different from the others rendered ones) that they are Overlay Plugins, meaning they use Ogre::OverlayManager and Ogre::OverlayContainer. So their displayed content do no move with the camera in RViz (they are fixed).

Do you know why those plugins are not rendered in the streamed image?
Is there anything we can adapt to render those overlay plugins?