'$env/dynamic/public' variables don't get loaded if ssr = false.

[ottomated]

Describe the bug

If you use '$env/dynamic/public' to import variables from process.env when export const ssr = false;, but prerendering is not explicitly disabled, the variables won't be sent to the client.

This is (I assume) because the html file is prerendered at build time, and uses the build-time variables. At runtime, it doesn't update the html file with the new values of process.env.

This works if export const prerender = false is set.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-9cnqal?file=src/lib/Vars.svelte

Logs

No response

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    @sveltejs/adapter-node: ^1.2.0 => 1.2.0 
    @sveltejs/kit: ^1.5.0 => 1.9.2 
    svelte: ^3.54.0 => 3.55.1 
    vite: ^4.0.0 => 4.1.4

Severity

serious, but I can work around it

Additional Information

No response

[Rich-Harris]

This is another manifestation of #8428. Perhaps we need to just disable that optimisation