Dear Laura Vargas Quintero,
Good day!!
Apologies for the inconvenience caused and please don’t worry, let’s work together on your concern and move towards a resolution path.
I understand your concern and to my knowledge, the behavior you are encountering is not an expected because SharePoint Online or OneDrive sync client will not create the files or folders automatically without any user intervention or any third-party application interacting with the OneDrive sync client.
I believe the problem need to be further investigated by the related development team via collecting the HAR logs, where the related team will look into the logs from their backend and find out the cause of the problem.
I do feel regret for not resolving the problem and redirecting you to the related development team but the fix to your concern can be find out through the HAR logs and suggest you raise a support ticket from the Office 365 admin center, where the related team will investigate the problem further by collecting the HAR logs.
Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: To create a support ticket, you need to have admin privileges and if you aren’t admin of your Office 365 organization, please contact the admin of creating a new ticket. How do I find my Microsoft 365 admin? - Microsoft Support
Appreciate your patience and understanding. Have a great day!!
Best Regards,
Sophia