I have a test page with an FullWith Hero Control:

I tried to edit this SitePage within an AzureFunction (.Net) with the latest PnP.Framework version.
The error occurs as soon as you load and save the SitePage without making any changes to it:

Here is the .csproj File. The PnP.Framework version is1.16.0:

Seems like there is an issue in the current version.
I have a test page with an FullWith Hero Control:
I tried to edit this SitePage within an AzureFunction (.Net) with the latest PnP.Framework version.
The error occurs as soon as you load and save the SitePage without making any changes to it:
Here is the .csproj File. The PnP.Framework version is1.16.0:
Seems like there is an issue in the current version.