CanvasSection ->Collapsible Section needs SectionType=1 from pnp.core in order to have new section data saved

In order to get the new functionality around Collapsible Section from pnp.core to pnp.framework i did try to expand the
\pnpframework\src\lib\PnP.Framework\Provisioning\Model\SharePoint\ModernExperiences\CanvasSection.cs with the Properties from \pnpcore\src\sdk\PnP.Core\Model\SharePoint\Pages\public\ICanvasSection.cs.

That way i would be able to prepare for template support. Unfortunatelly the new sections settings are not saved if SectionType=0 but SectionType is only pnp.core internal, so it can not be set from pnp.framework.

@jansenbe: I could not see why SectionType should be private and not available in interface - ok to change or did you have an other idea to get this to pnpframework

Currently Collapsible Sections on a out-of-the-box site make webparts fail to load after colapse/expande multiple times. In Browserconsole you can see that PageContext is missing or DOM can not be read.