Static Group Mapping may not work with the OU which contains "()"

SYMPTOM:

Trying to use the Nested Group for Windows AD.
The "testuser"'s DN is "CN=test user,OU=Test. Test (Test),DC=winkvm,DC=localdomain".
Using "groupMemberFormat": "${dn}" does not allow me to get the groups for this testuser (works with other users which do not belong to this OU).

FYI, using the following ldapsearch command works:

ldapsearch -x -H ldap://172.17.0.101:389 -D administrator@winkvm.localdomain -w '********' -b 'dc=winkvm,dc=localdomain' '(&(objectClass=group)(&(cn=*)(member:1.2.840.113556.1.4.1941:=CN=test user,OU=Test. Test \(Test\),DC=winkvm,DC=localdomain)))' cn member

EXPECTED BEHAVIOUR:

If this is caused by not escaping "()", not sure which exact characters should be escaped but probably at least "()" should be escaped if Windows AD is used.