Affinity Publisher Workbook -- Root Box Brochure -- Wrong Sizes!

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Just wanted to let you know that the "Root Box Brochure" in the Publisher workbook contains a SERIOUS error:

All pages of the trifold are of the exact same size (in the written tutorial as well as in the downloadable project files) -- however, every designer should know that the page that is folded inwards (called ,panel 3' in the tutorials) needs to be a smidgen smaller (2-3 mm) than the others to fold in properly.

I think in a workbook that aims to teach people not only about the software, but also about design basics, this is an essential piece of information that needs to be included -- otherwise either the fold is incorrect or the folded brochure bulges a bit because the inner page presses agains the fold.