There are two types of modules you can configure in Plesk Sitebuilder Wizard:
Page modules, or special pages. These modules are added to your site as separate web pages on the Pages step of the Wizard.
Block modules. These modules do not require dedicated site pages: they are inserted into ordinary HTML pages, and work as embedded functional blocks.
So in this case as Blog is page module, it can not work with block modules as these modules are inserted into simple HTML pages.
I am not sure if it will be changed in future.