
Earlier this year, Google deprecated the old vocabulary-data
breadcrumb list schema and replaced it with the official Schema.org BreadcrumbList
one.
Structured data schemas such as schema.org and data-vocabulary.org are used to define shared meaningful structures for markup-based applications on the Web. With the increasing usage and popularity of schema.org we decided to focus our development on a single SD scheme. As of April 6, 2020, data-vocabulary.org markup will no longer be eligible for Google rich result features.
Google Webmaster Central Blog
This deprecation has been postponed until June 2020, due to the Coronavirus situation.
One month later, this seems to be live. If you’re getting warnings when checking for breadcrumbs rich results or via your Google Search Console, here’s what you need to do:
Old schema (before):
<p>
<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
<a href="https://www.example.com/" itemprop="url"><small itemprop="title">Home</small></a>
</span> »
<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
<a href="https://www.example.com/about/" itemprop="url"><small itemprop="title">About</small></a>
</span> »
<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
<a href="https://www.example.com/contact/" itemprop="url"><small itemprop="title">Contact</small></a>
</span>
</p>
New schema (after):
<ol itemscope itemtype="https://schema.org/BreadcrumbList">
<li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
<a href="https://www.example.com" itemprop="item"><span itemprop="name">Home</span></a>
<meta itemprop="position" content="1">
</li>
<li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
<a href="https://www.example.com/about/" itemprop="item"><span itemprop="name">About</span></a>
<meta itemprop="position" content="2">
</li>
<li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
<a href="https://www.example.com/contact/" itemprop="item"><span itemprop="name">Contact</span></a>
<meta itemprop="position" content="3">
</li>
</ol>
Note the more structured architecture, allowing for a parent element, no more rogue separators – use CSS for that – and a new numbering sequence.

Test your site now – https://search.google.com/test/rich-results – and see if your breadcrumbs are correctly implemented.
Additional reading:
https://developers.google.com/search/docs/data-types/breadcrumb
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