gatsby-plugin-netlify-cms converting circular structure to JSON

Description

I am migrating a Gatsby page from v2 to v3. In my project I am using gatsby-plugin-netlify-cms together with netlify-cms-app both on newest version. Locally gatsby develop and gatsby build are working perfectly. I am facing no problems at all, but when it comes to running within a pipeline on gitlab I am running into an error. I have already run gatsby clean without any effect. Also I deactivated the cache within the pipeline. If I remove gatsby-plugin-netlify-cms from gatsy-config.js the build process succeeds also on CI. NPM and NODE are running on the same versions in both environments.

Steps to reproduce

1. Add gatsby-plugin-netlify-cms together with netlify-cms-app to package.json
2. Import gatsby-plugin-netlify-cms in gatsy-config.js
3. Run gatsby build locally and on CI.

Expected result

gatsby build should succeed on pipeline like it does locally.

Actual result

gatsby build fails with the error shown in the screenshot above.

Environment

System:
    OS: Linux 4.19 Debian GNU/Linux 9 (stretch) 9 (stretch)
    CPU: (1) x64 Intel(R) Xeon(R) CPU @ 2.30GHz
    Shell: 4.4.12 - /bin/bash
  Binaries:
    Node: 12.22.1 - /usr/local/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 6.14.12 - /usr/local/bin/npm
  Languages:
    Python: 2.7.13 - /usr/bin/python
  npmPackages:
    gatsby: 3.4.1 => 3.4.1 
    gatsby-image: 3.4.0 => 3.4.0 
    gatsby-plugin-gdpr-cookies: 2.0.0 => 2.0.0 
    gatsby-plugin-json-remark: 1.1.5 => 1.1.5 
    gatsby-plugin-manifest: 3.4.0 => 3.4.0 
    gatsby-plugin-netlify-cms: 5.4.1 => 5.4.1 
    gatsby-plugin-react-helmet: 4.4.0 => 4.4.0 
    gatsby-plugin-react-svg: 3.0.1 => 3.0.1 
    gatsby-plugin-remove-serviceworker: 1.0.0 => 1.0.0 
    gatsby-plugin-robots-txt: 1.5.6 => 1.5.6 
    gatsby-plugin-s3: 0.3.8 => 0.3.8 
    gatsby-plugin-sharp: 3.4.1 => 3.4.1 
    gatsby-plugin-sitemap: 2.12.0 => 2.12.0 
    gatsby-plugin-styled-components: 4.4.0 => 4.4.0 
    gatsby-remark-custom-blocks: 3.4.0 => 3.4.0 
    gatsby-remark-images: 5.1.0 => 5.1.0 
    gatsby-source-filesystem: 3.4.0 => 3.4.0 
    gatsby-source-graphql: 3.4.0 => 3.4.0 
    gatsby-transformer-json: 3.4.0 => 3.4.0 
    gatsby-transformer-remark: 4.1.0 => 4.1.0 
    gatsby-transformer-remark-frontmatter: 1.0.1 => 1.0.1 
    gatsby-transformer-sharp: 3.4.0 => 3.4.0 

[floka94]

@LekoArts same problem here! I created a minimal reproduction repo here >https://gitlab.com/flo_kas/bug-repro<, as you can see, my build job is also failing with the same error >https://gitlab.com/flo_kas/bug-repro/-/jobs/1247734074<

[github-actions[bot]]

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