When customizing the GridChildTable or GridGroup by deriving the GridChildTable in the custom engine, the OnInitializeVisibleCounters method and the OnEnsureInitialized method are to be overridden along with the other overrides. Otherwise the GridChildTable calls into the GridChildTable extend methods and sometimes bypasses methods like IsChildVisible, that you have overridden.
In the OnInitializeVisibleCounters override, the Total Visible Elements count, the Total Vertical Scroll Distance of elements in pixels, and the Total Custom Count of the visible elements must be calculated and set to the CachedVisibleCount, CachedYamountCount, and CachedVisibleCustomCount respectively. And the OnEnsureInitialized override method must return False, that is, when changes are detected and the object is not updated, to ensure that the object is up to date.
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