Why does temporal AA mess with my particle effects?

I have a particle effect with a texture that is transparent in some places. When I have temporal AA on it turns my particles to almost all the way transparent. FXAA and None are fine. Why is this?

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If you think about Temporal AA as quickly offsetting the frame, then sampling the difference to smooth out the jaggies, you can imagine anything that moves rapidly between samples would soften/to translucent…

If you enable the UseResponsiveAA flag in your material the look of your particles will improve.

Ok thanks alot