when use overlay translucent error

man slapo-translucent says:

   If neither translucent_local nor translucent_remote are specified, the default behavior is
   to search the remote database with the complete search filter. If only translucent_local is
   specified, searches will only be run on the local database. Likewise, if only translu-
   cent_remote is specified, searches will only be run on the remote database. In any case,
    both the local and remote entries corresponding to a search result will be merged before
    being returned to the client.

#######################################################
# Primary database definitions
#######################################################

######################################################
#databse bdb
#####################################################
database bdb

suffix          "dc=test,dc=com"
rootdn          "cn=Manager,dc=test,dc=com"
rootpw          "123456"
directory       /usr/local/ldap/var/openldap-data

index objectClass eq

######################################################
#overlays
######################################################

overlay         translucent
#translucent_remote     street
#translucent_local      street

uri             ldap://remote:388
lastmod         off
idassert-bind   bindmethod=simple
                binddn="cn=Manager,dc=test,dc=com"

######################################################

#######################################################
# Primary database definitions
#######################################################
database bdb
suffix "dc=test,dc=com"
rootdn "cn=Manager,dc=ec,dc=com"
rootpw "123456"
directory "/usr/local/ldap1/var/openldap-data"

index objectClass eq

#######################################################

remote database have a entry:

# 111, GF3, ec.com
dn: o=111,o=GF3,dc=test,dc=com
objectClass: organization
o: 111
street: remote

and in the local database change the street value:

# 111, GF3, ec.com
dn: o=111,o=GF3,dc=test,dc=com
objectClass: organization
o: 111
street: local

then change the value "translucent_remote and translucent_local" in the local proxy conf。Do search in local:

1 set "translucent_local street"

"ldapsearch -D "cn=Manager,dc=test,dc=com" -x -w 123456 -b "dc=test,dc=com" street=local"

the result is:

                   # extended LDIF
                   #
                   # LDAPv3
                   # base <dc=test,dc=com> with scope subtree
                   # filter: street=local
                   # requesting: ALL
                   #

                   # 111, GF3, ec.com
                    dn: o=111,o=GF3,dc=ec,dc=com
                    objectClass: organization
                    o: 111
                    street: local

It is right.

2 set "translucent_remote street"
"ldapsearch -D "cn=Manager,dc=test,dc=com" -x -w 123456 -b "dc=test,dc=com" street=local"

have no result.

"ldapsearch -D "cn=Manager,dc=test,dc=com" -x -w 123456 -b "dc=test,dc=com" street=remote"

have no result

why?

3 do not set any

"ldapsearch -D "cn=Manager,dc=test,dc=com" -x -w 123456 -b "dc=test,dc=com" street=local"

have no result.

"ldapsearch -D "cn=Manager,dc=test,dc=com" -x -w 123456 -b "dc=test,dc=com" street=remote"

have no result

why?