block.json not load javascript

I have the same issue.

same here, I’m also integrating with acf

What I found was, annoyingly, that for js I have to use wp_register_script and then use the script handle in block.json. Similar to what you see here https://support.advancedcustomfields.com/forums/topic/acf6-register_block_type-assets/

The action to enqueue the script has to be a higher priority than registering the acf blocks