Runtime error with Vapor, CSS `v-bind` and optional root node

[skirtles-code]

Vue version

3.6.0-beta.1

Link to minimal reproduction

https://play.vuejs.org/#eNp9UU1LAzEQ/StDLrXQbpWKh7otqBTUg4p6DMg2O1tTs0lIsmul7H93kqW1B+lpd+Z98N5kx26szdoG2YzlXjhpA3gMjYW2sMYtuJY1fQPswGEFHVTO1DAgwYBrroXRPoAwyjiYR8bZwGE5GHKdT3o3cqAhYG1VEZAmgLyULbRjWc05qwrlkTMQqvCeZlJztriX+YRIxM4nR1IaffhRCF4YiyVtMuLDLpqmDDOyXUldnqVpeM11l5JE0YKNWCChruQ623ijqXFSciZMbaVC92yDpEKczXrPiBVKme/HtAuuwdF+Lz5RfP2z3/ht3HH24tCja6ncAQuFW2Po4eXbE27p/wDWpmwUsU+Ar+iNamLGnnbb6JJiH/FS2of0YlKv3/1yG1D7fakYNDK7xOeMXvHuRPW/uNPsMunonnTFjxZd9KQDTrOr7Hy8wlBkF6z7Bc0fw7Q=

Steps to reproduce

Open the Playground and check the console:

TypeError: Cannot read properties of undefined (reading 'nodes')

The Playground is using v-if="false" to make the root node optional, but using v-for="i in []" instead also triggers a similar error.

[edison1105]

closed via #14268