Iris Shader screen is invisible

this i the second modpack i have used recently that has had this issue version: 1.21.1 modpack: The oblivion https://www.curseforge.com/minecraft/modpacks/the-oblivion modpack version:2.4.5 the buttons are still there because i can click on them it is just invisible

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The Oblivion

Oblivion is a story-driven modpack focused on community, progression, and adventure. Build towns, form teams, elect leaders, and complete massive quests that shape the world. 119 Downloads | Modpacks