Using this endpoint:
And this listitementitytypefullname:
The property '__metadata' does not exist on type 'Microsoft.SharePoint.Comments.comment'. Make sure to only use property names that are defined by the type.
Where is it getting the "type" from? Shouldn't it be using the listitementitytypefullname? And if that's the wrong type, reflect that in the error? And if wrong, what should the listitementitytypefullname: be for site page comments?