This is an upstream issue with tdewolff/minify. The js.Build minify option works fine.

Problem originally reported here:
google/docsy#2345 (comment)

Example:

git clone --single-branch -b hugo-github-issue-14086 https://github.com/jmooring/hugo-testing hugo-github-issue-14086
cd hugo-github-issue-14086
npm ci
hugo server

With v0.151.2 (tdewolff/minify v2.24.3):

With v0.152.1 (tdewolff/minify v2.24.4):

Upstream issue: tdewolff/minify#863