FlatList contentContainerStyle borderRadius

I am trying to give borderRadius to FlatList's contentContainerStyle but after the items are rendered (images), the backgroundColor of contentContainerStyle become transparent. Without borderRadius everything works fine, backgroundColor stays the same (black). I can't explain to myself this behavior. This is happening only on ANDROID, iOS works fine.

This is my FlatList code:

<Animated.FlatList                contentInsetAdjustmentBehavior={'never'}                overScrollMode="never"                scrollEventThrottle={16}                onScroll={Animated.event([                  {                    nativeEvent: {                      contentOffset: {y: this.scrollYAnimatedValue},                    },                  },                ])}                style={[style.verticalList, {flex: 1}]}                data={this.state.list}                contentContainerStyle={{                  paddingBottom: this.props.insets.bottom +125,                  marginTop: this.props.insets.top + 30,                  backgroundColor: 'black',                  flexGrow: 1,                  borderTopLeftRadius: 15,                  borderTopRightRadius: 15,                  overflow: 'hidden',                }}                ListHeaderComponent={() => this.renderHeader()}                renderItem={({item, index, separators}) =>                  this.renderEarlierElement(item, index, separators)                }                ListEmptyComponent={() => this.listEmptyEarlier()}                keyExtractor={(item, index) => item.sender}                showsVerticalScrollIndicator={false}              />