Access Plugin does NOT work for overridden display ? [#1207638]

I have a views, it contain three different displays:

display_id	access php code	overridden access control
default	`return true;`	No
block_1	`return true;`	No
block_2	`return false;`	Yes

And both block_1, and block_2 are enabled in the current theme.

	block_1	block_2
Expectation	visible	invisible
Observation	visible	visible ??

Reason:
I checked the access function in views_php_plugin_access.inc:

  function access($account) {
		
    if (!empty($this->options['php_access'])) {
			print_r($this->view->name);
			print_r('<br>');
			print_r($this->view->current_display);
			print_r('<br>');
      return views_php_check_access($this->options['php_access'], $this->view->name, $this->view->current_display, $account);
    }
    return TRUE;
  }

And found out that, no matter for which display( block_1, block_2), $this->view->current_display == 'default', which means that:
the php access plugin will always use the php code for default display to determine the accessibility of any other displays, even if the display has overridde php access code.