Thorns Heavily Bugged- not proccing

I am running a pure thorns build, there are many instances where thorns are not activating properly. I am running Crown of the Pale King so all hits should be proccing thorns.

Archer Transcendent has been the most intense, and I will add to this list as I keep playing. I sat there for 15 seconds 1v1 against this archer, patiently just watching, getting shot by projectiles, and I believe due to the archer having an energy shield, the thorns were not proccing? Not entirely sure.
I have noticed this happening over and over, and kept telling myself I am probably just not understanding what constitutes as a hit (fire walls, for example are not hits, blood pools and poison pools.. although certain pools do proc thorns?).

I was thinking maybe the Unique helmet is bugged, but archer projectiles are as clear of a hit as you can get. Just a regular white archer mob, not proccing thorns. No other mob alive nearby that could be influencing it. I have zero evasion, and the hits were definitely hitting my health bar and shield (both of which proc thorns normally).

Doryani's Triumph, boss, his lightning ability where he spawns a slow tracking rapid ticking lightning bolt barrage don't count as hits? Again, using Unique crown of the pale king, anything that isn't a Damage over Time should be a hit. That should have caused thorns procs.

This is not his lightning aura where you have to stand inside of the radius, this is the lightning barrage ability he uses around 50% or so hp, highly lethal without very high lightning res. I stood in it, it certainly was hitting me and did not proc thorns.