Well I guess the ZV-1 doesn't allow the user to expose their camera serial number at all. The ICLE models (starting with firmware update to alpha 9) allow the user to "expose" their serial number by writing that value to the standard Exif serial number tag.
Apparently Sony has not enabled this for the ZV-1 (or maybe ZV-E10). There should be a menu option to write the serial number.
If that isn't an option due to Sony's cameras, then you will need to use Hot Codes instead of basic code replacements. I invented this specifically for the situation where your workflow involves using serial number but you introduce a Sony camera that doesn't support (write to the file) this important metadata.
https://docs.camerabits.com/support/solutions/articles/48000358684-hot-codesIn the meantime, I will disable the code that is introducing the random 6 character string as the serial number. Obviously this value should not be changing from frame to frame. If it did not change from frame to frame but remained the same strange 6 character value, then that should be OK anyway regarding workflow (it doesn't have to be THE serial number just consistent and different for each camera).
Hopefully the Hot Codes will solve your problem and also clean up your dialogs.
--dennis