Escaped links/images lose escaping after formatting

What happened?

Formatting markdoc like \[a](https://example.com) formats to [a](https://example.com). It removes the escaping when it should preserve it.

To reproduce

For all of these examples, when rendered, they correctly render the escaped content

\[a](https://example.com)

\!\[a](https://example.com)

\<https://example.com>

When passed through Markdoc.format though, the result is

[a](https://example.com)

![a](https://example.com)

<https://example.com>

with the escaping removed which shouldn't happen

Version

0.5.4

Additional context

No response