The reflection pass is executed before the screen texture pass, this means that any object with a custom material that depends on SCREEN_TEXTURE variable in the fragment shader will not be part of the object list rendered by the reflection probe. For a better experience, we can render the screen texture pass first with reflections disabled, this will make the objects that are supposed to receive the reflections from the probe to be rendered without any reflections on them, then we can render the reflection pass as usual with the list of objects including the objects that access SCREEN_TEXTURE