Fragment inside Stack doesn't render anything

[mkapal]

Works:

<Stack>
  <Button>1</Button>
  <Button>2</Button>
</Stack>

Doesn't work:

<Stack>
  {items.map(item => (
    <React.Fragment key={item.id}>
      <Button>{item.id}</Button>
      <Button>{item.name}</Button>
    </>
  )}
</Stack>