Create an interactive Dice Roller app: Android Basics with Compose

[JDgoldvox]

URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-compose-build-a-dice-roller-app?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-compose-unit-2-pathway-2%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-compose-build-a-dice-roller-app#6

In which task and step of the codelab can this issue be found?
Step 7 in this line: "Underneath the instantiation of the result variable, create an immutable imageResource variable set to a when expression that accepts a result variable and then set each possible result to its drawable."

Describe the problem
It should be mutable instead of immutable because the image changes on update