@User have you raised an issue? I checked from Druid community on this. Did you delete the data of Postgres container? Druid used Postgres to manage meta data of segments and thus the data at Postgres will be needed to reload data from S3.
We can test this by breaking other components except Postgress or we need to take a dump of Postgres data before deleting and load that data on Postgres boot. Or use RDS altogether instead of self-hosting Postgres.
I was looking for an issue to dump this for further discussion.