Bundle size increase using gatsby-browser.js vs layout

[wildpow]

I noticed a bundle size increase of 4.25 Kb by adding a provider to gatsby-browser.js vs. adding the provider to layout.js. I noticed commons-2e60b884bb29ca9d80b0.js when using the layout method. As I understand it, Gatsby will bundle common packages if they are present in enough pages but, this optimization does not seem to happen when using the browser API. If this is the case per provider, then it would add up as your project grew. Any idea why this is?

gatsby.browser.js

export const wrapRootElement = ({ element }) => (
  <StoreProvider>{element}</StoreProvider>
);

---

layout.js

function Layout({ children }) {
  return <StoreProvider>{children}</StoreProvider>;
}

---

 System:
    OS: macOS 10.15.7
    CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 15.13.0 - /usr/local/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 7.7.6 - /usr/local/bin/npm
  Languages:
    Python: 2.7.16 - /usr/bin/python
  Browsers:
    Chrome: 89.0.4389.114
    Firefox: 86.0.1
    Safari: 14.0.3
  npmPackages:
    gatsby: ^3.1.2 => 3.2.1
    gatsby-plugin-algolia: ^0.18.0 => 0.18.0
    gatsby-plugin-canonical-urls: ^3.2.0 => 3.2.0
    gatsby-plugin-catch-links: ^3.2.0 => 3.2.0
    gatsby-plugin-goober: ^2.4.0 => 2.4.0
    gatsby-plugin-google-analytics: ^3.2.0 => 3.2.0
    gatsby-plugin-image: ^1.2.0 => 1.2.0
    gatsby-plugin-manifest: ^3.2.0 => 3.2.0
    gatsby-plugin-preact: ^5.2.0 => 5.2.0
    gatsby-plugin-react-helmet: ^4.2.0 => 4.2.0
    gatsby-plugin-react-svg: ^3.0.0 => 3.0.0
    gatsby-plugin-remove-serviceworker: ^1.0.0 => 1.0.0
    gatsby-plugin-robots-txt: ^1.5.5 => 1.5.5
    gatsby-plugin-sharp: ^3.2.0 => 3.2.0
    gatsby-plugin-sitemap: ^3.2.0 => 3.2.0
    gatsby-plugin-webpack-bundle-analyser-v2: ^1.1.21 => 1.1.21
    gatsby-remark-images-datocms: ^0.1.0 => 0.1.0
    gatsby-source-datocms: ^2.6.10 => 2.6.10
    gatsby-source-filesystem: ^3.2.0 => 3.2.0
    gatsby-source-shopify: ^4.2.0 => 4.2.0
    gatsby-transformer-remark: ^3.2.0 => 3.2.0
    gatsby-transformer-sharp: ^3.2.0 => 3.2.0
  npmGlobalPackages:
    gatsby-cli: 3.2.0