The same thing happened to me. Occurs each instance of Sil'Dihn Subterrene. One run being at 14:40 (02:30 p.m) GMT+2 30/05/2023. I had Variant Rampart and Variant Cure equiped and play on Odin with Windows DirectX11. languange setting is in English and nothing else is in Japanese exept for affected text. I ran solo as well.