Select2 javascript error

Or, maybe it’s an error in ACF.

This is still a problem.

You can put this in your functions.php file.

// Fix WP Notification Bars bug.
add_filter( 'mtsnb_force_bar_post_types', function() {
	if ( is_admin() ) {
		return [];
	}
	return [ 'post', 'page' ];
}, 10, 3 );

I had forgotten that we figured out the workaround 2 years prior.

because it’s still a problem.

https://wordpress.org/support/topic/bug-select2-v3-js-errors-with-acf/