I have the following flow set up. It was working fine for months, then just stopped. No amount of tweaking/fiddling seems to help.

All 3 site addresses are the same.
The error status is 400 and the body of the error is:
{
"status": 400,
"message": "Non-supported type ListItem for copy/move jobs. CallStack -- at Microsoft.SharePoint.Deployment.ExportObjectManager..ctor(SPDeployment deploymentDriver, SPSite site, SqlSession sqlSession, SPDeploymentSettings settings)\r\n at Microsoft.SharePoint.Deployment.SPExport.InitializeExport()\r\n at Microsoft.SharePoint.Deployment.SPExport.Run()\r\nclientRequestId: 7b58ddfb-bdba-4c9c-8cb3-c83a120fb030\r\nserviceRequestId: 7b58ddfb-bdba-4c9c-8cb3-c83a120fb030"
}
It is correctly getting the name of the PDF file to move.

Suggestions on how to proceed?