drawing objects with drawTo using a mask filter seems to not work

[jefvel]

I am trying to draw a bunch of objects to a single texture, each having a mask filter. It doesn't seem to work, since it results in an empty texture. Here's a reproducible sample.

It does work if I call drawTo in the update loop though, as seen in the sample.

rttmask.zip

*Edit
It does work if the object that is drawn is first added to the scene. To solve it currently I just add the object to the scene, draw it to texture, then remove it from the scene.