The Table field on the new report UI does not display any table to select after the instance has been upgraded.
Unknown at this time but issue is node specific.
Restart the affected node(s).
1) Identify the node the user is currently logged in by either typing in stats.do in the filter navigator or in the URL directly (i.e. instancename.service-now.com/stats.do)
The node number can be found on the second line of the page where it says:
Connected to cluster node: app00000.sjc000.service-now.com:instance_name[node_number]
2) Attempt to clear the instance cache using cache.do to see if it resolves the issue.
3) If the above doesn't resolve the issue open a case in Support portal with the affected node names/numbers to have a support engineer restarts the affected node(s).
Using classic UI for creating the report works as expected. This is only affecting the new report UI.