Arnold reflections in shadow matte material look bad and they have been broken for years now. Please fix this.
Mental ray and ART work perfectly with matte/shadow/reflections in Max 2017- the last version to have rendering engine shipping with Max to have proper reflections. I teach compositing cg and live footage in Max and I'd like to upgrade my classes to use Max 2020 and Arnold this fall, but I can't justify teaching something that's not working.
Added an image for clarification. Max 2020 Arnold and Max 2017 ART scenes attached. Thank you for reading.