We have created a new case button and placed this custom button in the account related list.

Button Definition:
/500/e?retURL=%2F500%2Fo 
&cas4_lkid={!Account.Id} 
&CF00N0q000000GN5a={! $User.LastName } 
&RecordType=0120q00000007Aa

The above button is working for classic users but when switched to lightning experience this button is working and auto-populating other fields except for "Account ID".

What do we have to do for the above button populate "Account id" also in Lightning?