Fatal crash with all configurations of "paired shortcodes"

[Aescetic]

What version of Hugo are you using (hugo version)?

$ hugo version
Hugo Static Site Generator v0.71.1/extended darwin/amd64 BuildDate: unknown

Does this issue reproduce with the latest release?

This is the latest release.

Explanation

"Paired shortcodes" as described here, namely:

{{% mdshortcode %}}Stuff to `process` in the *center*.{{% /mdshortcode %}}

&

{{< highlight go >}} A bunch of code here {{< /highlight >}}

...Produce a fatal crash identical to the crash described in issue #7322. This issue may also be related to issue #7106.

I've examined the code surrounding shortcodes, and it is clearly very fragile, but the immediate problem can be solved with minor changes.

[bep]

There are thousands of "paired shortcodes" in Hugo sites that I somehow manage, and I have yet to experience a crash, so your general statement above isn't true.

Lets take this in #7322.

[github-actions]

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