causes structured data testing tool (SDTT) errors to fly from alternate

Is there any good reason why using <base href="https://example.com/"/> causes structured data testing tool (SDTT) errors to fly from alternate links such as <link rel="alternate" href="this.html"/>?

Simplistic example, try running this through it...should fail:

<!DOCTYPE html>
<html dir="ltr" lang="en">
<base href="https://example.com/" />
<link rel="alternate" href="this.html"/>
</head>
<body>
</body>
</html>

Then running this through it should work (reporting no structured data):

<!DOCTYPE html>
<html dir="ltr" lang="en">
<base>https://example.com/</base>
<link rel="alternate" href="this.html"/>
</head>
<body>
</body>
</html>

Some thoughts: www.w3schools.com/tags/tag_base.asp (we use <base />, so its HTML version)

Differences Between HTML and XHTML

In HTML the <base> tag has no end tag.
In XHTML the <base> tag must be properly closed.

Compared to: www.w3schools.com/tags/tag_link.asp which seems to have the paradox logic (as in, all we use is HTML version <link /> with non issue, except when combined with rel="alternate")

Differences Between HTML and XHTML

In HTML the <link> tag has no end tag.
In XHTML the <link> tag must be properly closed.

Is the use of rel="alternate" that strict and must be XHTML compliant or something?

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