Webpack error on gatsby build with gatsby-plugin-netlify-cms

[Pearce-Ropion]

Hello,
I am working on upgrading to gatsby 3 (from 2) and have run into an issue while running gatsby build. The issue does not occur in development. I have also confirmed that the issue is caused by the webpack process that is initialized in gatsby-plugin-netlfiy-cms as removing that plugin allows the build to complete normally.

Base on this issue, I thought that the issue may have been caused by a webpack version mismatch within my node_modules however, after confirming that only 1 version of webpack was installed, the issue persists

UNHANDLED REJECTION Cannot read property 'buildMeta' of undefined
  TypeError: Cannot read property 'buildMeta' of undefined
  - HarmonyImportSpecifierDependency.js:156 HarmonyImportSpecifierDependency.getWarnings
    [frontend]/[webpack]/lib/dependencies/HarmonyImportSpecifierDependency.js:156:37
  - Compilation.js:2579 Compilation.reportDependencyErrorsAndWarnings
    [frontend]/[webpack]/lib/Compilation.js:2579:24
  - Compilation.js:2197 
    [frontend]/[webpack]/lib/Compilation.js:2197:10
  - FlagDependencyExportsPlugin.js:376 
    [frontend]/[webpack]/lib/FlagDependencyExportsPlugin.js:376:11
  - async.js:2830 
    [frontend]/[neo-async]/async.js:2830:7
  - async.js:2850 Object.each
    [frontend]/[neo-async]/async.js:2850:39
  - FlagDependencyExportsPlugin.js:355 
    [frontend]/[webpack]/lib/FlagDependencyExportsPlugin.js:355:18
  - async.js:2830 
    [frontend]/[neo-async]/async.js:2830:7
  - async.js:2865 done
    [frontend]/[neo-async]/async.js:2865:11
  - async.js:2818 
    [frontend]/[neo-async]/async.js:2818:7
  - FlagDependencyExportsPlugin.js:88 
    [frontend]/[webpack]/lib/FlagDependencyExportsPlugin.js:88:11
  - Cache.js:91 
    [frontend]/[webpack]/lib/Cache.js:91:34
  - MemoryCachePlugin.js:45 Array.<anonymous>
    [frontend]/[webpack]/lib/cache/MemoryCachePlugin.js:45:13
  - Cache.js:91 
    [frontend]/[webpack]/lib/Cache.js:91:19
  - runMicrotasks
  - task_queues.js:93 processTicksAndRejections
    internal/process/task_queues.js:93:5

I've been banging my head against the wall for a few days on this, any help would be appreciated