Hm, seems it is official now: Terraform officially doesn't support alternative S3 implementations for state storage anymore. It's only AWS S3 now.

https://github.com/hashicorp/terraform/issues/34086#issuecomment-1773248189

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S3 state storage backend broken for Ceph S3 · Issue #34086 · hashicorp/terraform

Terraform Version Terraform v1.6.1 on linux_amd64 + provider registry.terraform.io/hashicorp/consul v2.17.0 + provider registry.terraform.io/hashicorp/nomad v1.4.17 + provider registry.terraform.io...

GitHub
@mmeier hm maybe you can open an issue to #OpenTF instead