In the sepulcher of the lost (beach-donut shaped map) monolith of fate, while in spriggan form, the button to summon healing totems doesn’t function. Using an Xbox controller with default configuration this is the Y button. This is in the Ending the Storm timeline.
The skill works using the keyboard hot key, just not on the controller. This persists throughout the entire map. I have verified this occurrence 3 times now.
All other skills function normally on the controller and keyboard.