Hmm. I had no this issue. Probably cause I’ve used the RenderComponent:
Try doing this instead of disabling Two Sided then:
That is modified DefaultSpriteMaterial.
TwoSidedSign node is returning -1 for backside of the polygon and 1 for front face. Saturate clamps it to 0-1.
This way you can also use it to render 2 different textures on back and front (just plug one to lerp).