Custom Gutenberg block with nested InnerBlocks renderAppender not displaying add button

In gc-slider2/index.js, I removed the templateLock=”all” from the InnerBlocks, and it is now displaying the plus sign for the gc-slider-items block.

    <InnerBlocks
        template={SLIDER_TEMPLATE}
        allowedBlocks={ [ ] }
    />

Which leaves me with a different problem of two add block plus signs. See Gutenberg Innerblocks notallowedblocks on parent but allowedblock on child

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