I started this issue so that there would be a context for the improvements that I prepared :)

The plugin does not process blocks if they are specified in the payload config and are used as blockReferences in the collection

Step to reproduce:

1. Create block config:

import type { Block } from 'payload'

export const ReferenceBlock: Block = {
  slug: 'ReferenceBlock',
  fields: [
    {
      name: 'title',
      type: 'text',
      required: true,
    },
  ],
}

2. Add blocks section with new block to payload.config.ts

export default buildConfig({
  // ...
  blocks: [ReferenceBlock],
  // ...
})

3. Add to collection:

    {
      name: 'contentRef',
      type: 'blocks',
      blocks: [],
      blockReferences: ['ReferenceBlock'],
    }

Expected result:

I see ReferenceBlock in openapi docs

Actual result

Error with text:
Invalid reference token: ReferenceBlock