Hi,
We would like some more information.
1. Can you confirm you are using WordPress 5.6.1? You can check by clicking on the W in the top left and selecting About. If you need to update, please check with your host provider.?Please know that if you are using an older version of WordPress Core you may experience unexpected behavior with Yoast.?This guide explains more:?https://yoast.com/why-we-dont-support-old-wordpress-versions/.
2. Are all your non-Yoast plugins and themes also updated?
3. We had another recent release. Can you confirm you are using the most recent Yoast SEO, v15.8? If you update, does the issue resolve?
4. Can you confirm you are using the Yoast SEO Breadcrumbs? You would either need to manually enter in the code snippet to use them or your theme would need to come with it. If you are not sure, you may need to contact your host provider. This guide explains more: https://yoast.com/help/implement-wordpress-seo-breadcrumbs/.