CP Alerts set at runtime override all deferred alerts?

I have a situation where I want to display an alert to the user when they load my add-on’s settings screen if certain conditions are met. To do this, I’m using a now() alert call. e.g.

if($vars['token_status'] == 'error')
{
    ee('CP/Alert')->makeInline('shared-form')
        ->asWarning()
        ->withTitle(lang('da_existing_token_error_heading'))
        ->addToBody(lang('da_existing_token_error'))
        ->cannotClose()
        ->now();
}

But I’m also redirecting back to this same screen after I save some settings, and in that save method, I’m deferring a success message:

ee('CP/Alert')->makeInline('shared-form')
        ->asSuccess()
        ->withTitle(lang('da_token_saved_heading'))
        ->addToBody(lang('da_token_saved_desc'))
        ->defer();

The issue is that sometimes I’ll need to display both alerts on the same screen, each generated by a different method (one at runtime, one before a redirect) - but it appears as though the existence of any now() alerts removes any previous defer() alerts - is that correct? And if so, any way around this?