I played this weeks trials and went flawless. The new Trials shader dropped for me, as announced, but I wasn't able to pick it up due to "full inventory", even though no part of my inventory was full. The shader did not go to my postmaster, so it's just gone now
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I've heard its a data issue if you have acquired most of the shaders in the game. Apparently if you've acquired most of the shaders in the game you ran out of data space for shaders. Regardless the cause probably a really low priority fix I did notice it wasnt in collections either so I hope its as simple as claim from collections once added but theres no telling.