Infinity Edge deals true damage to Illaoi's spirit while Conqueror doesn't

I really hate these inconsistencies. I sent a bug report a few days ago of Infinity Edge and i also mentioned the Conqueror differences. The Infinity Edge bug was solved, but the difference in interactions wasn't, which means they're basically intended to be different. My question is. Why? Why shouldn' Conqueror deal true damage against the spirit? At first i though it was because of the technology, but Infinity Edge can deal it, so it's not that...
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