One of the Tenents of Akarat in the Field of Giants, the one which is slightly on top and to the right of the waypoint has not been interactable for some time. The nearby stones light up, I destroy the tentacles that surround the tenent and nothing happens. I watched videos of how to get it, I do the same thing, but still the tenent is not interactable.
I’ve done finished the Tenets of Akarat on soft and hardcore in the past 2 days, all of them worked eventually. A few I couldn’t interact with but once I restarted the game they worked. Some need one, two or three stones, some in certain order, some you destroy the tentacles etc. Maybe try restarting the game and lighting stones in a different order, buggy interactions have probably got you but all worked for me eventually.