I use this to remove HTML temporary, until a patch is here
add_filter( 'acf/load_field/type=select', function( $field ) {
if ( is_array( $field['choices'] ) )
array_walk_recursive( $field['choices'], function( &$value, $key ) {
$value = wp_strip_all_tags( $value );
} );
return $field;
} );