After reecent updates (probably 2.1) putting silent legion armor in delving bench won’t give you chieftain armor recipe. Tested with 200 armor pieces on single player.
Please provide a step-by-step process of how the bug can be reproduced. The more details you provide us with the easier it will be for us to find and fix the bug:
1.put armor pieces in delving bench
2.waste time and resources
3.no profit
4.be sad
It Delved to Chieftan Armor Not Silent Legion. I don’t know of any Armor that you Delve that Delve’s to itself. I will add as of Patch 2.1.1 It still Delve’s but Produces no Chieftan Recipe.
Pride of Aesir does but I am fairly certain that delving Silent Legion into Silent Legion Recipe was never a thing. You are correct in saying that currently delving armors is pretty broken.