Knitting my *.Rmd file into a PowerPoint presentation still worked perfectly last year, but now throws warnings like:
Powerpoint template warning: Couldn't find layout named "Section Header" in provided reference doc.
This is helpful and nicely indicates why the result does not have the style I set and expected.
I assume this issue to be due to PowerPoint not consistently using the same names in style templates.
Indeed, I can partially fix this by renaming the style templates to match the ones RMarkdown/Bookdown/knitr are expecting. However, the renaming is laborious and error-prone.
Did anyone of you experience a similar problem with newer versions of PowerPoint? I read some description saying that this could also be due to the language settings PowerPoint is using, but chaning them to US-English didn't help: The names of the templates were actually English before, they were just slightly different than the ones expected by RMarkdown.