All documents are classified as unknown after upgrading to 126.96.36.199 for batches sent through an encrypted batch class. This only effects encrypted batch classes that were already imported to a 188.8.131.52 system which is then upgraded to 184.108.40.206.
Between release 220.127.116.11 and 18.104.22.168, there was a change to the encryption schema for encrypted batch classes. When upgrading from 22.214.171.124 to 126.96.36.199, if the batch class was encrypted before the upgrade, all batch instances will have documents classified as unknown document types.
The solution to this is after you upgrade from 188.8.131.52 to 184.108.40.206, you will need to ‘learn files’ in the encrypted batch class before sending any batch instances though the encrypted batch class.