Encryption key "updated" date-time field meaning

Operating system

macOS

Joplin version

2.14.20

Desktop version info

Joplin 2.14.20 (prod, darwin)

Client ID: efca17d7e7cb433fa0e3f630530088b1
Sync Version: 3
Profile Version: 46
Keychain Supported: Yes

Revision: cfd98e3

ABC Sheet Music Plugin: 1.0.4
Backup: 1.4.0
Kanban: 1.0.7
Note Tabs: 1.4.0
Table Formatter Plugin: 1.2.1

Sync target

OneDrive

What issue do you have?

Hi.
No issues at this moment, just a question about Joplin encryption.

Why was my encryption key updated recently?

I have not clicked on re-encryption button. I have not had any messages about outdated algorithms. I have not created new keys.

Is there some key rotation mechanism that updates keys without asking the user?
In general, what are the cases when the "Updated" date-time value is not equal to "Created"?

Should I worry because the key was updated (and I don't know how and why)?

Screenshots