ScrollRect resetting scroll position on content change

I found the problem. Having any kind of layout group of the view port will change the behaviour when objects are added to the content pragmatically. Also making sure the Contents anchor points and pivot are set correctly. For a Vertical scrollRect you want them to be like this

This worked for me, attached this to the scrollbar

 void OnEnable()
 {
     StartCoroutine(resetScrollPos());
 }
 
 IEnumerator resetScrollPos()
 {
     yield return null; // Waiting just one frame is probably good enough, yield return null does that
     gameObject.GetComponent<Scrollbar>().value = 1;
 }

Create a ScrollRectExtensions class

 public static class ScrollRectExtensions
 {
     public static float GetValue(this ScrollRect scrollRect, float value)
     {
         return scrollRect.horizontal ?
                 scrollRect.horizontalNormalizedPosition :
                 scrollRect.verticalNormalizedPosition;
     }
 
     public static void SetValue(this ScrollRect scrollRect, float value)
     {
         if (scrollRect.horizontal)
         {
             scrollRect.horizontalNormalizedPosition = value;
         }
         else
         {
             scrollRect.verticalNormalizedPosition = value;
         }
     }
 }

In your code, call:

 void Awake()
 {
             StartCoroutine(FixScrollRects());
 }
 
 IEnumerator FixScrollRects()
 {
             yield return new WaitForEndOfFrame();
             yield return new WaitForEndOfFrame();
             foreach (var scrollRect in GetComponentsInChildren<ScrollRect>())
             {
                 scrollRect.SetValue(0);
             }
 }

Double WaitForEndOfFrame(); was necessary in my case. (2019.3.1f)

did you solve the problem?

I have the same issue, the images in my content reset when I pressed the play button, I use a VerticalLayyoutGroup, can anymore give me the solution, please? THX