Fix vector type fields should not be encoded as strings (#2772)

[bsbodden]

Pull Request check-list

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• [✅] Do tests and lints pass with this change?
• [✅] Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• [✅] Is the new or changed code fully tested?
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Description of change

Addresses #2772