Slug and permalink are not synced

@syaho

Ideally, though, the slug shouldn’t be too long: keep it short and focused, but make sure it’s instantly clear what your page is about.

Matt Cutts from Google mentions the following regarding the length of your slug:

If you can make your title four- or five-words long – and it is pretty natural. If you have got a three, four or five words in your URL, that can be perfectly normal. As it gets a little longer, then it starts to look a little worse. Now, our algorithms typically will just weight those words less and just not give you as much credit.

More info here: https://yoast.com/wordpress-seo-url-permalink/

That’s the ideal situation, but that does not answer my question. Why aren’t they synced and how can I solve that?

It is expected that when you have a long permalink, the slug in the Yoast SEO preview would cut off as it mimics a Google search preview.

Breadcrumb on Google snippets may not reflect the permalink and slug you’ve. You expect the breadcrumb structure to show the permalink.

Please bear in mind that, they are actually an enhancement to your search results and can let your users (and Google) understand the structure of your site content. Google adjusts the breadcrumbs to appear in Google search results, and you can take advantage of this if you use Yoast SEO or add the correct form of structured data to your site.

You can learn more about it here — https://yoast.com/breadcrumbs-seo/

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