How to Fix the GitHub Copilot Chat Error: 'Cannot read properties of undefined (reading 'split')'

If you're using GitHub Copilot Chat within Visual Studio code, you may begin to see an error unexpectedly after an IDE update that reads as follows when using Copilot Chat:

Cannot read properties of undefined (reading 'split')

This is caused by the Copilot Chat extension requiring a reload which can be seen from the extensions menu:

Once selecting, 'Reload Required,' Visual Studio Code will reload, and Copilot Chat will begin working as expected again.