Hi,
If still exist in ST06.
You can delete from following method.
1. Run RZ21 --> Topology --> Segment Overview and click Display Overview.
2. Click Local Segments Tab --> Edit and delete the entries from the list (which is old application server).
3. And save it.
It will solve the issue.
I was facing same issue and solved from above method.
Even, it was not showing in SAPWLSERV table, solved my issue.
Thanks
Ashwani