Using components in <svelte:head> creates duplicate elements on hydration #4533
Description
If we include a component inside <svelte:head>:
<svelte:head>
<A/>
</svelte:head>with A.svelte:
<meta property="x" content="y"/>this meta is duplicated, not fixed by #4082.
If this is discouraged we should throw a warning.
P.S.:
Note that this is only a problem in the reported example. There is no problem when done this way:
<!-- Main.svelte --> <A/><!-- A.svelte --> <svelte:head> <meta property="x" content="y"/> </svelte:head>