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Setting contentOffset and contentInset in FlatList breaks viewabilityConfigCallbackPairs logic #26282

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@viventus

Description

React Native version: 0.60.5, Platform: iOS

Describe what you expected to happen:
At intial render should call onViewableItemsChanged in viewabilityConfig

Snack, code example, screenshot, or link to a repository:

public render() {
        const viewabilityConfigCallbackPairs: ViewabilityConfigCallbackPairs = [
            {
                viewabilityConfig: {
                    minimumViewTime: 800,
                    itemVisiblePercentThreshold: 50,
                },
                onViewableItemsChanged: ({changed}) => {
                    console.log(changed);
                },
            },
        ];
        
        const contentInset: Insets = {top: 15};
        const contentOffset: PointPropType = {y: -15, x: 0}

        return (
            <FlatList
                ListEmptyComponent={this.renderEmptyElement()}
                ListFooterComponent={FixedFooterBottomInsetView}
                ListHeaderComponent={this.renderHeaderComponent}
                data={items}
                renderItem={this.handleRenderItem}
                keyExtractor={this.keyExtractor}
                onEndReached={this.handleOnEndReach}
                onEndReachedThreshold={REACH_LIST_END_SCREENS}
                viewabilityConfigCallbackPairs={viewabilityConfigCallbackPairs}
                onRefresh={this.handleListRefresh}
                refreshing={isRefreshing}
                showsVerticalScrollIndicator={false}
                onScroll={this.handleScroll}
                maxToRenderPerBatch={MAX_TO_RENDER_PER_BATCH}
                windowSize={WINDOW_SIZE}
                initialNumToRender={INITIAL_NUM_TO_RENDER}
                updateCellsBatchingPeriod={UPDATE_CELLS_BATCHING_PERIOD}
                contentOffset={contentOffset}
                contentInset={contentInset}
                scrollEventThrottle={1}
                automaticallyAdjustContentInsets={false}
                onScrollToIndexFailed={noop}
            />
        );
    }

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