Good Question :
Never Come across this scenario, Technically ERSPAN all over should good, so you should not miss anything.
Since you have a requirement, good to test ERSPAN to SPAN, SPAN to ERPAN for small traffic and see if that works ( I am interested in learning here your test). - make sure there are limitation - may not work.
If I get a chance over the weekend will do some tests
some reference and limitation :
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-3s/lanswitch-xe-3s-book/lnsw-conf-erspan.html