Callout for errors like: TypeError: Cannot read properties of null (reading 'id')

[chrisbonifacio]

Describe the content issue: A clear and concise description of what the content issue is. Is there content missing or is there incorrect content?

There should be a callout for errors where subscription and mutation selection sets don't match, resulting in errors like the following:

TypeError: Cannot read properties of null (reading 'id')

Add to the Troubleshooting section for discoverability

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