I previously used the file Badlogic sent me a couple weeks ago,
I just updated and yes, clipping is supported, tint black isn't supported though, and that's what I see:
Also in case you need it, here's all the files
And If I change the color of the tint:
Testing the additive setting with grey instead of red proves additive blending works also perfectly fine. It's just the tint black that has a funny behaviour...