Hi again, I have been maybe a bit optimistic. 3.2 is still not ready for rouge2, but there is work upstream and maybe it will be integrated in 3.3. The problem you see is related I think to an incompatibility with kramdown, the default markdown renderer, and the version 2 of rouge, the default syntax highlighter.
The WIP from upstream members is available in a pull request: https://github.com/jekyll/jekyll/pull/5230 but using this patch fixes some issues (pre missing for fenced code blocks), it doesn't seem to help for indented code blocks... I was able to see again pre tags for your code block by either replacing kramdown by redcarpet, or rouge by coderay or pygments (which was I think the default syntax highlighter in Jekyll 2.x). This might be a workaround for your issue. Cheers, Cédric
