Replacing specific Gutenberg blocks

I am not sure If I get what you meant, but study https://developer.wordpress.org/reference/hooks/render_block_this-name/ filter, whan calling it give it $accepted_args number of 3 and inspect what is returned in $block_content or $instance. ID is encoded as ref attribute, if that’s what you are missing.

You could also use render_block filter, but render_block_{$this->name} is more convenient, since it is called just for block type specified in filter name.

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