Fix a few small issues with prerendering in v7

[brophdawg11]

Note: 2 of these changes have since been made in Remix v2 so we can remove the first 2 commits from here once they are brought over:

• https://github.com/remix-run/remix/pull/9695
• https://github.com/remix-run/remix/pull/9792

[changeset-bot[bot]]

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Latest commit: 651b5f62d99618c74025827419c5adc6e5885143

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[github-actions[bot]]

🤖 Hello there,

We just published version 6.28.2-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!