That is expected behavior that the "Workflows In Progress" says 0 on the target side even though there had been workflows in progress on the source side.
It may be that the workflows still work when a brand new instance of a workflow is run from the target tenant.
Starting in November 2020, SharePoint 2013 workflows will be turned off by default for new tenants. Existing SharePoint 2013 workflows remain supported but deprecated, with services supported until 2026.
So the SP 2013 Workflows need to be explicitly turned on the target side.