Good afternoon mates. I contacted support and they gave me a solution that worked for me.
I share it with you. Luck
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The register_block_type() expects a filesystem path(as illustrated at https://drive.google.com/file/d/1j_IaTnRnEJLFraiUKsYrdi5yEhWSkzy8/view?usp=sharing).
That said, please try using the __DIR__ . ‘/path-to-the-block-file.json ensuring the complete path to .json file is added. For example:
register_block_type( __DIR__ . ‘/blocks/testimonial/block.json’ );
In other words, you can try replacing get_template_directory_uri() with __DIR__ or get_template_directory() in block registration code.
Also, confirm if the path returned resolves to your /block.json file.
