I have a couple OAS specs in my app. One of them loads a schema from another spec file, using something like this:

components:
  specs:
    MyFoo:
      $ref: '../otherdir/otherspec.yaml#/components/schemas/Foo'

I have oapi-codegen configured thus:

package: mythingy
generate:
  models: true
  client: true
  gin-server: true
  embedded-spec: true
import-mapping:
  "../otherdir/otherspec.yaml": "mymodule/otherthingy"
output: generated.go

I added a CI step to verify the committed generated code was up to date, and started noticing random failures. In the failure cases, the schemas from the externally referenced spec were missing.

I was able to reproduce this locally by running a loop:

( set -x ; while go run github.com/deepmap/oapi-codegen/v2/cmd/oapi-codegen -config oapi-codegen.yaml ./openapi.yaml ; do git diff --exit-code || break ; done )

This fails within 10 loops at most for me.

This looks a lot like #1055, but that was closed as "using an old version". I'm reproducing this with the latest release (v2.1.0).