The Necrotic Grip exotic isn’t restoring melee energy when a corrupted combatant dies, which is half of its perk.
There also seems to be an issue where the corruption doesn’t spread when a combatant is corrupted by using Thorne and they die from corruption. I have to kill them with Thorne for it to spread.
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Well, one of your problems is that there's a gun in D2 called, "Thorn." I'm going to assume that you're using, "Bella Thorne," which is mostly toxic and poisonous for anyone stupid enough to cast her. Bella Thorne can only be weaponized against others in film, television, and social media, which is primarily how her corruption spreads. Also, using Bella Thorne puts you at risk for migraines, bleeding eardrums, involuntary self-directed face-punching, Clamydia, Gonorrhea, HPV, FIV, Parvovirus, and an exceptionally rare strain of Simian Herpes. It should be obvious just by looking at her.