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Rendering a component after a hydration mismatch throws an error #12253

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@angelov-a

Description

@angelov-a

Vue version

3.5.12

Link to minimal reproduction

https://play.vuejs.org/#__PROD____SSR__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

Steps to reproduce

  1. Open the playground reproduction
  2. Click Toggle
  3. Observe the error in the console

What is expected?

No errors should appear.

What is actually happening?

TypeError: t is null

System Info

System:
    OS: macOS 15.0.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 1.04 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.9.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.3 - /usr/local/bin/npm
    bun: 1.1.29 - ~/.bun/bin/bun
  Browsers:
    Chrome: 116.0.5845.179
    Edge: 121.0.2277.98
    Safari: 18.0.1
  npmPackages:
    vue: 3.5.12 => 3.5.12

Any additional comments?

Does not throw an error if conditioned with an if-else clause. See the second reproduction:
https://play.vuejs.org/#__PROD____SSR__eNqdU01v2zAM/SusLk2B2MbW7dI5wT7QAdthG9YeBRSqLbtqZcmQZDdAkP9eUo5dp1+HnmzxPVKPj9SWfWvbtO8kO2O5L5xqA3gZunbNjWpa6wJswZoL6Xrp/jlZyVDcwA4qZxs4xrzjLzMi4ksobNN2QZYHrIn0A9GfQnu5B9NsipCMWTmKX7rukEiBkcdNYY0PUGlRw4ouXwSET7h5KnixOIHVOhLTXmisuYKKrkRung1tY8N4CLJptQgS8AiQl6qHUgSRCK3tfdIo3wisF0GEr7sQrIGvhVbF3YqzvZIj+nK2DrautcyzgTYmPTrQJ6rCrD0dsjkjdt4nkngTcJQkB2hMn7IhSQbVGcrGvzwbu8EDW7Lg0a9K1emttwbnvSUyZzQvpaX72waFfnJ2BhEhLLb9O8bI2uUYL25kcfdC/NZvKMYZOu9pBJxNWBCulmGAzy/+yA3+T2Bjy04j+w3wv/RWd6RxoH3vTImyZ7yo9lfcHmXqS3++CdL4sSkSSsxd5HOGW0RWvtb6o9zT9FPM42aHLh6s67NX8/I2Tcu0H2TcvbdGNV/1d9wxtvpa+St8G+QLlj5NP6cfPrLdA3/VWQs=

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    🔨 p3-minor-bugPriority 3: this fixes a bug, but is an edge case that only affects very specific usage.scope: ssr

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