I've encountered this issue where my characters get stuck in the left wall (unable to move/buff) when smokescreen is flush with the wall and Horntail does its knockback skill, pushing you into the corner. As a party member, you can simply leave party to get unstuck, but if the shadower casting the smokescreen gets knocked back (mid-cast), you are stuck until the smoke ends. Should be relatively easy to recreate as it's happened on numerous runs, thanks!
https://royals.ms/forum/threads/smokescreen-bug.142312/#post-840639 this is known bug. kick shadower or stucked person from the PT so they will be unstuck.