Docker Buildx Does Not Seem To Respect Output Type Flag

[justinba1010]

It seems that the output type flag is ignored during exports. Not sure if I am using this incorrectly. It seems to be documented here:
https://docs.docker.com/build/exporters/oci-docker/

Goal: To build a tarball that has the docker layout instead of OCI, in v24 and below this was default OCI Compliance PR

Steps to recreate:

1. Compile a dockerfile build (used the hello world example)

➜  hello-world git:(master) ✗ docker buildx build --output type=docker -t hello .

2. Save a tarball of image

➜  hello-world git:(master) ✗ docker save hello:latest -o out.tar

It would be expected that this tarball would have a docker image layout but it seems to be exported as an OCI image.

➜  hello-world git:(master) ✗ tar -tvf out.tar | grep oci
-rw-r--r-- 0/0              31 1969-12-31 19:00 oci-layout

There seems to be documentation for other methods to skip the save step, but I have been unable to get those to work as well.

➜  hello-world git:(master) ✗ docker buildx build --output "type=docker,tar=true,dest=out.tar" -t hello .
[+] Building 0.0s (0/0)                                                                    docker:default
ERROR: Docker exporter is not supported for the docker driver.
Switch to a different driver, or turn on the containerd image store, and try again.
Learn more at https://docs.docker.com/go/build-exporters/
➜  hello-world git:(master) ✗ docker buildx build --output "type=docker,tar=true" -t hello . 

➜  hello-world git:(master) ✗ docker version
Client: Docker Engine - Community
 Version:           26.1.2
 API version:       1.45
 Go version:        go1.21.10
 Git commit:        211e74b
 Built:             Wed May  8 13:59:59 2024
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          26.1.2
  API version:      1.45 (minimum version 1.24)
  Go version:       go1.21.10
  Git commit:       ef1912d
  Built:            Wed May  8 13:59:59 2024
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.31
  GitCommit:        e377cd56a71523140ca6ae87e30244719194a521
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0```