Terraform plan in GitHub Actions PR check fails with state lock error

Quick question, has anyone seen this weird error? with my GitHub Actions workflow when attempting to run terraform plan on pull requests for Genesys Cloud resources.

The pipeline uses a remote backend with DynamoDB state locking. On the pull_request event, the job initializes the backend and runs the plan. However, it consistently fails with a state lock error, even though no other jobs are running.

Error acquiring the state lock
Lock Info:
 ID: 12345
 Path: gen/gc-config
 Operation: OperationTypeApply
 Who: ci-runner@github-host
 Version: 1.6.0
 Created: 2023-10-27 10:00:00 +0000 UTC
 Info:

The workflow YAML is standard:

name: TF Plan
on:
 pull_request:
jobs:
 plan:
 runs-on: ubuntu-latest
 steps:
 - uses: actions/checkout@v3
 - uses: hashicorp/setup-terraform@v2
 - run: terraform init
 - run: terraform plan

Is there a specific configuration required for the Terraform CLI to acquire a read-only lock or bypass the lock for plan operations in a CI environment? The apply step on merge works fine, suggesting the lock is released correctly there.