Hi,
For SU01 role removal, you do not need S_USER_AGR with 02, and as you mentioned both authorizations available in production, if so trace should not show you the S_USER_AGR with 02 with RC=04.
I would recommend to do role comparison for the user performing the activity. and then check if you have the S_USER_AGR with 02 in user buffer SU56.
But ideally it should not ask you S_USER_AGR for 02 through SU01, so please take help of abaper to debug it.
Also put trace in non-prd to see if S_USER_AGR is getting checked with 02 for removal through SU01.
BR,
Mangesh