Shaders not allowed any more on IOS from 1.18.30

Shaders not allowed any more on IOS from 1.18.30, I don't know if it's intentional but DO please fix it and we'd be grateful! I know that Windows Bedrock has long banned the use of third party shaders and now it might be affecting the IOS & Android? Hope you will give us a clear explanation of why it's happening.