Can't use React components contained in a local plugin

Description

While local plugins totally work for accessing Gatsby hooks, I can’t seem to make them work for just loading a React component.

Steps to reproduce

1. Generated project from gatsby new gatsby-component-plugin-bug
2. Created plugins/gatsby-local-plugin and added the required files (index.js, gatsby-config.js) and ran npm install
3. Moved the implementation of header.js from the src directory to inside the new plugin
4. Adjusted paths
5. Added the local plugin

I created this as a Git repo with the first commit being the starting point from gatsby new and the second commit being all of the changes I made: https://github.com/wirehead/gatsby-component-plugin-bug

Expected result

I expected the header.js component from the gatsby-local-plugin plugin to load.

Actual result

> gatsby develop

success open and validate gatsby-configs - 0.052s
success load plugins - 2.393s
successIonPreInit - 0.005s
successainitialize cache - 0.008s
success copy gatsby files - 0.191s
success onPreBootstrap - 0.024s
success createSchemaCustomization - 0.011s
success source and transform nodes - 0.098s
success building schema - 0.345s
successecreatePages - 0.002s
success createPagesStatefully - 0.096s
success onPreExtractQueries - 0.002s
success update schema - 0.029s
success extract queries from components - 0.305s
success write out requires - 0.047s
success write out redirect data - 0.004s
success Build manifest and related icons - 0.123s
success onPostBootstrap - 0.130s
⠀
info bootstrap finished - 8.768 s
⠀
success run queries - 0.155s - 7/7 45.02/s
success Generating image thumbnails - 4.277s - 6/6 1.40/s

 ERROR #98123  WEBPACK

Generating development JavaScript bundle failed

Can't resolve 'gatsby-local-plugin/header' in 'C:\Users\wirehead\Documents\src\gatsby-component-plugin-bug\src\component
s'

File: src\components\layout.js

faileddBuilding development bundle - 20.027s

Environment

System: OS: Windows 10 10.0.18363 CPU: (4) x64 Intel® Core™ i5-7500 CPU @ 3.40GHz Binaries: Node: 10.19.0 - C:\Program Files\nodejs\node.EXE npm: 6.14.4 - C:\Program Files\nodejs\npm.CMD Browsers: Edge: 44.18362.449.0 npmPackages: gatsby: ^2.20.12 => 2.20.12 gatsby-image: ^2.3.1 => 2.3.1 gatsby-plugin-manifest: ^2.3.3 => 2.3.3 gatsby-plugin-offline: ^3.1.2 => 3.1.2 gatsby-plugin-react-helmet: ^3.2.1 => 3.2.1 gatsby-plugin-sharp: ^2.5.3 => 2.5.3 gatsby-source-filesystem: ^2.2.2 => 2.2.2 gatsby-transformer-sharp: ^2.4.3 => 2.4.3

[LekoArts]

We’d be happy to receive a PR adding this. @wirehead would you be up for it? https://www.gatsbyjs.org/contributing/docs-contributions/

[wirehead]

Awesome, can you put that in the docs section?