[MRTK 2.6.1]Scrolling Object Collection do not render item elements based properly

[spartan1047]

I'm making a HoloLens app that is intended to display a list of users from a ser in a Holographic UI, for this I'm using the scrolling object collections, My prefab is based on the one provided in the Examples scenes, but displaying a 3x3 grid that can be scrolled horizontally. The items are a based on the default 32x32 HoloLens 2 button. I have created a new icon set to display a custom icon.

At this moment I'm having these issues:
-The items are not being rendered properly. Once I make a button child of the GridObjectCollection it displays all the icons ignoring the Button Config Helper setup (set to use a Sprite in the Icon style property).
-When I scrol the collection, my custom icon keeps rendering outside the clipping box, it only disappers once the Item is deactivated because is fully outside the clipping box:

This issue happens in the Unity editor and the HoloLens device.

I'm using MRTK 2.6.1 and Unity 2019.4.24f1

TBH I don't know what to do to solve this issue, I made my prefab hierarchy basically by hand putting all values form one project to another.