[N1QL][UDF][RBAC] udf can be executed without the proper roles

I have a user that only has manage global functions perms

i have two functions
celsius and celsius1 they are both defined as

CREATE FUNCTION celsius(degrees) LANGUAGE INLINE AS (degrees - 32) * 5/9
CREATE FUNCTION celsius1(degrees) LANGUAGE INLINE AS (degrees - 32) * 5/9

ajaybhullar@SCML0613 ~ % curl -u johnDoe100:password1 http://172.23.104.110:8093/query/service -d 'statement=SELECT RAW celsius(10)'
{
"requestID": "8a25948b-91a7-421d-a5aa-91ba64fb70e3",
"signature": "json",
"results": [
],
"errors": [{"code":5010,"msg":"Error evaluating projection","reason":{"caller":"auth:392","code":13014,"key":"datastore.couchbase.insufficient_credentials","message":"User does not have credentials to run execute global functions. Add role query_execute_global_functions to allow the query to run."}}],
"status": "errors",
"metrics":

{"elapsedTime": "1.228252ms","executionTime": "1.067629ms","resultCount": 0,"resultSize": 0,"serviceLoad": 6,"errorCount": 1}

}
ajaybhullar@SCML0613 ~ % curl -u johnDoe100:password1 http://172.23.104.110:8093/query/service -d 'statement=SELECT RAW celsius1(10)'
{
"requestID": "bb3b4f3b-7dfb-41e5-9a45-6042a4e2c263",
"signature": "json",
"results": [
-12.222222222222221
],
"status": "success",
"metrics":

{"elapsedTime": "1.324873ms","executionTime": "1.195862ms","resultCount": 1,"resultSize": 19,"serviceLoad": 6}

}

this user ONLY has manage global functions perms, so both should not work