I have Eidolon Ally (did the initial quest steps for it) and just got the Necrochasm catalyst completed as per the "Patterns & Catalysts" section of the collections screen, but I don't have or got Necrochasm, and I also didn't get any Necrochasm related quest. The Eidolon Ally related quest has also disappeared from my quests overview.
What is going on here? How should this be going on?
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The triumph and catalyst complete notification unlock after you obtain 35 essence independent of actually owning the gun or catalyst. In your quest log you should have a quest named 'Bottomless Pit' that mot likely is on the step to defeat Crota. Once you do that step you will get Necrochasm. To get the catalyst there are 2 plate encounters that have to be done - one at bridge and the other after you beat Ir Yut