Instrumentation runs twice on built apps

[round relic]

So for some reason using the instrumentation it runs twice after doing yarn build then yarn start.
It only runs once for yarn dev though
instrumentation.js

export async function register() {
    if (process.env.NEXT_RUNTIME === 'nodejs') {
        console.log('Should only see once');
    }
}

yarn dev:
Should only see once
yarn start:
Should only see once
Should only see once

[sweet pilot]

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[round relic]

For a maybe unintended work around i found this will work

    if (process.env.NEXT_RUNTIME === 'nodejs' && typeof process.env.__NEXT_PRIVATE_PREBUNDLED_REACT === 'undefined') {