Blueprint does not use hst:content property of hst:site node

I have defined a blueprint for creating a subsite which should reuse existing content. The blueprint contains a hst:site node with the property hst:content pointing to the folder which should be reused.

When creating the subsite from the blueprint, the hst:site node of the newly created site points to the new content folder created by the blueprint, instead of the folder defined in the hst:content property of the hst:site node of the blueprint.