It looks like the renderer was changed in [Hugo 0.60.0](https://gohugo.io/news/0.60.0-relnotes/) to be CommonMark compliant. The previous hard line break needs to be updated to (sortof?) match the [CommonMark hard line break](https://spec.commonmark.org/0.29/#hard-line-breaks)
This is currently broke on the [Demo Site](https://themes.gohugo.io/theme/vncnt-hugo/) linked from https://themes.gohugo.io/vncnt-hugo/