wp-includes/class-wp-block-type.php:484Returns true if the block type is dynamic, or false otherwise. A dynamic block is one which defers its rendering to occur on-demand at runtime.
bool public function is_dynamic() { return is_callable( $this->render_callback ); }Introduced in 5.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-block-type.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.