[13.0-->14.0] google calendar dublicate calendar.event

[daonamutc1]

Module

Google calendar

Describe the bug

Odoo 13 is using google_internal_event_id field as sync base with google calendar.
Odoo 14, at the first sync, odoo adds to google calendar record the '%s_odoo_id'% self.env.cr.dbname field. This field is used to compare whether the record already exists or not.
After the migration, user sync, because the google calendar record does not contain the '%s_odoo_id'% self.env.cr.dbname field => create a new event.
For this reason, when users sync, the system adds duplicate events.

[pedrobaeza]

Can you propose a fix for this problem?