Help with using getBlockIndex

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Without the root id the block is looked for at the top-level1. Something like this seems to work:

useSelect(select => {
    const editor = select('core/block-editor')
    const rootId = editor.getBlockRootClientId(blockId)
    return editor.getBlockIndex(blockId, rootId)
}, [blockId])

[1] https://github.com/WordPress/gutenberg/blob/v9.9.3/packages/block-editor/src/store/selectors.js#L945

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