I didn't find anything in the T&C so here I am.
Does it matter if we submit a playground or a playground book?
Apparently he playgrounds author template doesn't work with Xcode 11.4.1 and the T&C say the playground is to be built with Xcode 11.4.1 so is it not possible to submit a playground book unless Apple updates the author template or is it ok to use an older version of Xcode?