The fact the it is related to the burn allowed me narrow it down bit more.
It happens when you cast Chaos Bolt, before having cast Cthonic Fissure and/or Infernal Shade.
As long as you start by cast Cthonic Fissure and Infernal Shade before casting Chaos Bolt you’re good to go.
Note that if you never use one of theses skill it’s also OK.
The exact step to reproduce the bug is :
Start the game
Cast Cthonic Fissure and/or Infernal Shade
Change zone
Cast Chaos Bolt before recasting the spell(s) from step 2
Also confirming “The Burn” causes this issue. Noticeable lag spike when first engaging enemies on a monolith, finish the monolith, start a new, and then a huge lag spike with memory being used out the wazoo to a crash.
Can add that THE BURN node in chaos bolts still hangs the game to 1 fps and causes it to hang and force to close down the game.
It seems that the interaction in between the nodes with Chaotic fissure node Return Below or might even be with Profane Veil infernal deliverance