Issue related to decrypt

The library is used to encrypt data, but the basic structure is in the form of "v1.aesgcm256.~~~~~.~~~~~~~". However, if the content is decoded using online decrypt in the "AES-256-GCM" mode, the content cannot be confirmed normally.

We are concerned about problems that may arise in the future. For example, although the library has been developed and later converted, the encryption method has been changed, but the encryption of existing encrypted data cannot be broken.

First of all, if the current encryption is normal, the data will come out in a structure called "v1.aesgcm256.~~~~~.~~~~~~~", is that correct?