Plugin : preimage and post image does contain process id and stage id attributes ?

 We have migrated code from crm 2013 onpremise to D365 online .  in onpremise plugin images are retrieving stage id and process id .  but it is so strange that 

postIncident.Attributes.Contains("stageid"),
postIncident.Attributes.Contains("processid") ,preIncident.Attributes.Contains("stageid"),preIncident.Attributes.Contains("processid")  returning false  in D365

Can anyone help on this ?

Many Thanks