Why Are Automated Snapshots in RDS Exceeding Configured Retention Period?

Hello all, Reg. Automated backups and snapshot retention in RDS MSSQL. I have an RDS instance running SQL Server and I have configured automated backups with a retention period of 3 days in the RDS console. According to my understanding this setting should retain automated snapshots for a maximum of 3 days. However I've noticed that the system is retaining automated snapshots for up to 5 days.

I've double-checked my RDS configuration and it clearly specifies a 3-days retention period for automated backups. I'm trying to understand why automated snapshots are being retained for a longer period than what I've configured.

Is there any specific reason why automated snapshots are exceeding the configured retention period? Are there any background processes or actions that might be extending the retention period beyond the configured 3 days?

How can I ensure that automated snapshots are retained in accordance with the retention period I've set (i.e., 3 days) and not beyond that duration?

I would greatly appreciate any insights, suggestions or guidance on this and ff there are any specific actions or checks I need to perform to address this issue. Thanks.