innerElementType doesn't work

[herzaso]

I have this code:

const InnerElementType = forwardRef<HTMLUListElement>(({ ...rest }, ref) => <ul ref={ref} {...rest} />);
...
        <AutoSizer className='h-40 w-full'>
          {({ width, height }: { width: number; height: number }) => (
            <FixedSizeList
              height={height}
              width={width}
              itemSize={56}
              itemCount={items.length}
              innerElementType={InnerElementType}
            >
              Item {items[index]}
            </FixedSizeList>
          )}
      </AutoSizer>

and I don't see any ul in the DOM. Am I doing something wrong?
For completeness, this is just a test since what I really want to do is to add a className to the inner component