Markdown: wrapping an inline HTML comment splits its paragraph

Prettier 3.9.6

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--parser markdown
--prose-wrap always
--print-width 20

Input:

alpha <!-- retained comment --> beta

Output:

alpha
<!-- retained comment -->
beta

Expected output:

alpha <!-- retained comment --> beta

Why?

Wrapping may vary, but this should remain one paragraph. Moving <!-- to the start of a line creates a CommonMark HTML block, leaving alpha and beta in separate paragraphs. proseWrap: preserve and width 120 preserve the original structure.

Also reproduced on development commit 891accaaab6dab0fbb5eba6748fbb1f5ac4809b5. Related #19510 concerns comments already on separate lines in lists.

GPT-6 Astra assisted; I manually reviewed this report.