Strange Behavior When Triggering Reusable Workflows via API — 404 “suffixed values” Error

[PuneetDwivediDnb]

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Bug

Body

We’re experiencing a strange regression with GitHub Actions related to reusable workflows and dispatching workflows via the API or gh CLI.

Setup

In the same repository, we have:

Workflow A

A reusable workflow triggered using workflow_call:

name: Workflow A
on:
  workflow_call:

jobs
   // some job goes here

Workflow B

A workflow triggered using workflow_dispatch that reuses Workflow A:

name: Workflow B
on:
  workflow_dispatch:

jobs:
  workflowA:
    uses: ./.github/workflows/workflowA.yml

The above setup is logically correct, and everything works as expected when triggered from the GitHub UI. This is our happy-path scenario for us.

Issue

In above setup, When we trigger Workflow Busing the GitHub API or the gh CLI, the workflow starts successfully and its run appears in the GitHub UI. However, when we try to retrieve that API‑triggered run using the GitHub API or gh CLI, we receive the following response

Response 404
{"message":"Unable to complete request that contains suffixed values in the response payloads."}

The difficult part is that the same setup was working perfectly until about a week ago or so.

Observations

When we replace the relative reference to Workflow A with an absolute reference in Workflow B, the issue disappears.
For ex:

name: Workflow B
on:
  workflow_dispatch:

jobs:
  workflowA:
    uses: owner/repo/.github/workflows/workflowA.yml@ref          # changed here to full import

Making above change start everything work as expected.

We recently observed this behaviour, and we have similar pattern across repos and orgs. We have use github api and cli in upstream & downstream pattern. Want to understand what is changed and why issue arises, as this all started breaking in a while.
To put some more context this behaviour is observed in enterprise version(*.ghe.com) of github. Thanks in advance....

[github-actions[bot]]

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