mangled values in binary or octetstring attribute types

Directory Studio mangles attributes that have binary or octet string syntax. For example, the entry at
ldap://ldap.nrca-ds.de:389/x509serialNumber=174,cn=CA DP Com 5:PN,ou=Signtrust,o=Deutsche Post Com GmbH,c=DE,dc=ldap,dc=nrca-ds,dc=de??base?(objectClass=*)
has an signatureRenewals attribute, that actually has a size of 776 bytes. However, Directory Studio reports the value as having a size of 1203 and viewing the data in the hex editor shows that the data has been changed.

For reference: The entry as LDIF export

1. 174, CA DP Com 5:PN, Signtrust, Deutsche Post Com GmbH, DE, ldap.nrca-ds.de
   dn: x509serialNumber=174,cn=CA DP Com 5:PN,ou=Signtrust,o=Deutsche Post Com Gm
   bH,c=DE,dc=ldap,dc=nrca-ds,dc=de
   x509issuer: CN=10R-CA 1:PN, O=Bundesnetzagentur, C=DE
   x509serialNumber: 174
   objectClass: x509caCertificate
   objectClass: signatureRenewalClass
   x509version: 3
   x509subject: CN=CA DP Com 5:PN, OU=Signtrust, O=Deutsche Post Com GmbH, C=DE
   x509validityNotBefore: 20050811082216Z
   x509validityNotAfter: 20071231081931Z
   x509subjectPublicKeyInfoAlgorithm: 1.2.840.113549.1.1.1
   x509signatureAlgorithm: 1.3.36.3.3.1.2
   x509caCert;binary:: MIIDwDCCAyygAwIBAgICAK4wCgYGKyQDAwECBQAwPzELMAkGA1UEBhMCRE
   UxGjAYBgNVBAoMEUJ1bmRlc25ldHphZ2VudHVyMRQwEgYDVQQDDAsxMFItQ0EgMTpQTjAeFw0wNTA
   4MTEwODIyMTZaFw0wNzEyMzEwODE5MzFaMFsxCzAJBgNVBAYTAkRFMR8wHQYDVQQKDBZEZXV0c2No
   ZSBQb3N0IENvbSBHbWJIMRIwEAYDVQQLDAlTaWdudHJ1c3QxFzAVBgNVBAMMDkNBIERQIENvbSA1O
   lBOMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCA8YGx+S8BrfFkkENEOYJ9kB2c70v3SzJy5d
   54tdBZ9Hr8VkNSC9KMfm5Mu8Lg0J3i30K3JxWuJ76UiZVOsdjc0FanPoRPJyghM+24NTQGnqvRJcf
   LZ+5YzgNcnVNP27O7eYkhmfSgkhla9abzci5GcTdh4svdzMuyRyw236mDiQIDAQABo4IBszCCAa8w
   DgYDVR0PAQH/BAQDAgIEMBgGCCsGAQUFBwEDBAwwCjAIBgYEAI5GAQEwSgYIKwYBBQUHAQEEPjA8M
   DoGCCsGAQUFBzABhi5odHRwOi8vb2NzcC5ucmNhLWRzLmRlOjgwODAvb2NzcC1vY3NwcmVzcG9uZG
   VyMBIGA1UdIAQLMAkwBwYFKyQIAQEwgbEGA1UdHwSBqTCBpjCBo6CBoKCBnYaBmmxkYXA6Ly9sZGF
   wLm5yY2EtZHMuZGU6Mzg5L0NOPUNSTCxPPUJ1bmRlc25ldHphZ2VudHVyLEM9REUsZGM9bGRhcCxk
   Yz1ucmNhLWRzLGRjPWRlP2NlcnRpZmljYXRlUmV2b2NhdGlvbkxpc3Q7YmluYXJ5P2Jhc2U/b2JqZ
   WN0Q2xhc3M9Y1JMRGlzdHJpYnV0aW9uUG9pbnQwGwYJKwYBBAHAbQMFBA4wDAYKKwYBBAHAbQMFAT
   ASBgNVHRMBAf8ECDAGAQH/AgEAMB8GA1UdIwQYMBaAFMPPderAEVNFE/6XZWMAaVMClrlkMB0GA1U
   dDgQWBBQiuyZlB1cV3gbrEB7Md4KnE3l0xjAKBgYrJAMDAQIFAAOBgQAYu6i+yozEQZeQrYXq6ahS
   0sKYXAKsEm0T8zBJN4JcBa+14JqibPqd6VDfnnxoE6CH140/N55NgajzquATw3nC6rRkFLY7FReQZ
   wp+xpiqH0QuxEsE56LnvuJEF/w/7ucbPGWCP3A3kD7InT7g6tTOaVQSLCI4VVzfX6ksRSaJmA==
   x509keyUsage: keyCertSign
   signatureRenewals:: MIIDBDCCAwAGCSqGSIb3DQEHAqCCAvEwggLtAgEDMQ8wDQYJYIZIAWUDBA
   IDBQAwgYoGCyqGSIb3DQEJEAEEoHsEeTB3AgEBBgorBgEEAcBtAwcBMFEwDQYJYIZIAWUDBAIDBQA
   EQB9dtoJqdAMACROdhHa3sSzLcmAqUy6h91/pxk/LKYAIfTeBM7mY2uCFhSmwP++ygO+DERSAfb/U
   1DanuXC841ICAgweGA8yMDA4MDMwNTEwNTgyMFoxggJIMIICRAIBATBFMD8xCzAJBgNVBAYTAkRFM
   RowGAYDVQQKDBFCdW5kZXNuZXR6YWdlbnR1cjEUMBIGA1UEAwwLMTJSLUNBIDE6UE4CAgFPMA0GCW
   CGSAFlAwQCAwUAoIHVMBoGCSqGSIb3DQEJAzENBgsqhkiG9w0BCRABBDBPBgkqhkiG9w0BCQQxQgR
   AoT8hsM+R8XGJidkIJuNExuR6gsSzRJ0KLvB0NdwBzg8tj0wfYTjuF7/o+uaWQ7wa/neWeBx+X5W6
   WTaxexbVjTBmBgsqhkiG9w0BCRACLzFXMFUwUzBRMA0GCWCGSAFlAwQCAwUABEBm9Z9GYk+LzNukR
   HfXRqDSZZ2PTrYTzgeclJ1NSm9TRfdxYUWQcKt+7xiL4w1ffa+fPOUiCDh7InAJHH5BiWxpMA0GCS
   qGSIb3DQEBAQUABIIBAHKcZZ7EVojxqIXMLPvLaxhLOQhis0+Yxcq46slaht5PegmlKj5OBOQuxRz
   D4ShyFomkLxNvMvj4yICoozZ/wWawxMEN31iWvTVcQpMp+4ukFUWvgCPbLd9p2s19QnG1O9WNcGw2
   1C92sRYkNObN/TZa+khxVQM9075k7V6obw6+MFWwU4IAKVhIXxBnVBqLerrBeVO/quisqm2m3l9MZ
   IORa/AQGrafWplYldQKdOiOUO7FJe+nyxq2Wzkg3zElkm8/jU6LXjP7C7pZceOU8ibuDWFKC4kuIl
   56zQ+YqPQnbixqPxDfIFNMMXiY2C9IpsRk/UnnDJ41Tt7rP0SklcU=