Component used: BottomAppBar

Version used: AS 4.1 Canary 8 + Compose snapshot at 6557927

I created a BottomAppBar with a FAB and cutout, and running the emulator it appears correct but in the preview the cutout is not rendered correctly.

Code:

@Composable
fun ReplyScaffold(content: @Composable () -> Unit) {
    Scaffold(
        backgroundColor = AppBackground,
        bottomBar = { ReplyBottomBar() },
        floatingActionButton = { ReplyFAB() },
        floatingActionButtonPosition = Scaffold.FabPosition.Center,
        isFloatingActionButtonDocked = true
    ) {
        content()
    }
}

@Composable
fun ReplyBottomBar() {
    // TODO: cutout doesn't work on preview
    BottomAppBar(cutoutShape = RoundedCornerShape(50)) {
        IconButton(onClick = {}) {
            Icon(Icons.Default.KeyboardArrowUp)
        }
        Spacer(modifier = Modifier.weight(1f))
        IconButton(onClick = {}) {
            Icon(Icons.Default.Search)
        }
    }
}

@Composable
fun ReplyFAB() {
    FloatingActionButton(
        onClick = {}
    ) {
        Icon(Icons.Default.Edit)
    }
}

@Preview
@Composable
fun ScaffoldPreview() {
    AppTheme {
        ReplyScaffold {
            Text("Hello")
        }
    }
}