It is easily reproducible by following these steps:

I have the following v-server under a given tenant

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d/vservers/vserver/1907783b-a811-47e9-9ea1-a4dba0444846

 

When I send the following GET request I get  the list of vservers under that tenant:

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d/vservers

 

 

When I delete the tenant under which the vserver is present. I am still able to see the vserver

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d/vservers/vserver/1907783b-a811-47e9-9ea1-a4dba0444846

 

I confirmed the tenant was gone by doing  a GET request and I got a 404

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d

 

I put the tenant with the exact same information and confirmed now the tenant exist.

 

When I send the following GET request no v-servers listed:

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d/vservers

 

However the following GET request still returns the vserver I had.

 

/aai/v16/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/lab-nfvi/tenants/tenant/c21ac68e8a5a49ceb3973541e709177d/vservers/vserver/1907783b-a811-47e9-9ea1-a4dba0444846

 

 So this means upon deletion of tenant vserver objects under that tenant are kept but when the tenant is put back the vservers are no under the tenant but still exist in AAI.