Regression in v3.9.7

I forgot to run a regression test before release, turns out the v3.9.7 version cause lots of changes on MDN repo.

Diff https://github.com/prettier/prettier-regression-testing/issues/731#issuecomment-5695113640

@seiyab I think it's caused by #19838, do you have time to look into it?

Prettier v3.9.7 Playground link

--parser markdown

Input:

**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128
{{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.


**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128
a {{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.

Output:

**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128

{{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.

**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128
a {{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.

Expected output:

**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128
{{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.


**ASCII** (_American Standard Code for Information Interchange_) is a {{glossary("character encoding")}} standard using 7-bit to represent 128
a {{glossary("character", "characters")}} used by computers and other devices for encoding letters, numbers, punctuation, and control codes into digital form.

Why?