@ubi-borealis

It's still not working (Into the fog), not sure what recording it will do it's exactly as everyone says.
you do about 1/2 damage and drain all of its stamina and then it continues to fight but takes no damage

CPU: AMD Ryaen 5 2600x (6 core)
GPU: Raedon RX 580
OS: Win 11 64 Pro
Driver: "30.0.14011.3017"
Graphics settings: High, V-Sync off.

Patch 1.4.1.2

https://photos.app.goo.gl/LmEdX5z6eVHvEpLx7: (https://photos.app.goo.gl/LmEdX5z6eVHvEpLx7)

This is the 10th reload, my DMG doesn't matter so I'm temp invincible just to be sure you can see it not work. (it fails when I take dmg too but it's harder to record).

If you have access its "Manual Save 3, Into The fog" which is just before the Examine point that puts up the memory barrier and starts the attack.
----

After trying again w/o invincibility it worked, but I quit to desktop reconnected and loaded the mentioned save.
I was only using invincibility twice in the twelve times I reloaded. (the first time and the one I recorded.) Maybe invincibility to the Player character can bug this? - maybe the bug lingered till I QtD)