How to decrypt old encryption format?

So, I am having issues with some notes, that all have kind of the same encryption format and all have the same date. They all look like this:

id: 20b33abd406e4fbba04a641379c818bd
mime: 
filename: 
created_time: 
**updated_time: 2021-05-26T07:13:05.019Z**
user_created_time: 
user_updated_time: 
file_extension: 
encryption_cipher_text: JED01000022052490216acf4a48dda16b3024781c8545000364{"iv":"+Y+iM2yqyyAVKkMSdSYSjA==","v":1,"iter":101,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"GbZXgPQp14g=","ct":"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"}
encryption_applied: 1
encryption_blob_encrypted: 
size: 
is_shared: 
share_id: 
master_key_id: 
type_: 4

This is one of the files. The date is always 2021-05-26. I thought that might be an old encryption format, after which I then updated joplin? So I downloaded Joplin 1.8.5 and tried to encrypt them. Joplin wanted the old encryption masterkey, which is disabled in my main Joplin program:

Screenshot 2023-01-30 124300

Now I don't know how to export that masterkey. And do you think that might that way or have you any other idea?


Version

Joplin 2.9.17 (prod, win32)

Client ID: ...
Sync Version: 3
Profile Version: 41
Keychain Supported: Yes

Revision: a84a8e7

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