3D Text desappear

Hello,

My 3D Text desappear depend where is my camera.


Do you know what can be the problem ?

Thanks for your help
JD

I figure out that the problem comes from my material. I use material with stencil mask. So I have translucency in material. If I switch to opaque, I don’t have this problem.

But I need this mask…

OK, I figure out that is not a problem of opacity with the material but maybe a bug. The letters moves and are hidden by the black box behind.