About usage of ToolbarFactoryInterface

[nbc38]

I was using Toolbar::getInstance until now. But it got deprecated and it is told to use ToolbarFactoryInterface.
So what I did is create toolbar instance by using

$toolbar = Factory::getContainer()->get(ToolbarFactoryInterface::class)->createToolbar($name);
$toolbar->standardButton('buttonName')->task(do.something') ...

Now the problem is that the button is not being rendered in the page. There is no error or anything.
I browsed through the issues and came to this: #25971 (comment)

That's exactly the problem. We cannot see the button.
So how are we supposed to replace the Toolbar::getInstance. I browsed through the source code but the deprecated code is being used all over the place.