Build error with prerendering for "mailto:", "tel:" and missing parent URL on a parent-child page

[tonprince]

Describe the bug

After commit of 'f12bbcc686829243f111db1b463d4a261fb67c23' I got several build errors in Sveltekit with prerendering enabled:

1. Anchors with href set to tel: and mailto: will fail with an error during prerendering (page not found)
2. Having a child URL, where the parent URL does not exists:

• Existing URL: /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries/High-Season
• Parent URL does not exists: /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries
  Even the parent URL is not referenced anywhere in other HTML files, Sveltekit tries to prerender the parent URL.

Reproduction

• Add anchor with href="mailto:" or href="tel:".
• Try to add 2 pages with parent-child structure where parent does not exists.

Logs

404 /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries (linked from /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries/High-Season)
Error: 404 /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries (linked from /Transfers/From-Trat/To-Koh-Kood/By-Boonsiri-High-Speed-Ferries/High-Season)
    at file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:86:11
    at visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:222:5)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)
    at async visit (file:///Users/tonprincepro/Dropbox/Tripstore/Website/workspace/com.tripstorekrabi/next/node_modules/@sveltejs/kit/dist/chunks/index4.js:293:6)

System Info

System:
    OS: macOS 12.0.1
    CPU: (16) x64 Intel(R) Xeon(R) W-2140B CPU @ 3.20GHz
    Memory: 7.41 GB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.0 - /usr/local/bin/node
    Yarn: 1.22.15 - ~/.yarn/bin/yarn
    npm: 6.14.15 - /usr/local/bin/npm
  Browsers:
    Chrome: 96.0.4664.55
    Edge: 96.0.1054.34
    Firefox: 94.0.2
    Safari: 15.1
  npmPackages:
    @googlemaps/js-api-loader: ^1.12.10 => 1.12.10 
    @sveltejs/adapter-vercel: next => 1.0.0-next.31 
    @sveltejs/kit: next => 1.0.0-next.200 
    @types/leaflet.fullscreen: ^1.6.1 => 1.6.1 
    bulma: ^0.9.3 => 0.9.3 
    bulma-toast: ^2.4.1 => 2.4.1 
    cookie: ^0.4.1 => 0.4.1 
    dayjs: ^1.10.7 => 1.10.7 
    ejs: ^3.1.6 => 3.1.6 
    fast-glob: ^3.2.7 => 3.2.7 
    firebase-admin: ^10.0.0 => 10.0.0 
    form-data: ^4.0.0 => 4.0.0 
    isbot: ^3.3.4 => 3.3.4 
    juice: ^8.0.0 => 8.0.0 
    leaflet: ^1.7.1 => 1.7.1 
    leaflet-routing-machine: ^3.2.12 => 3.2.12 
    leaflet.awesome-markers: ^2.0.5 => 2.0.5 
    leaflet.fullscreen: ^2.1.0 => 2.1.0 
    leaflet.gridlayer.googlemutant: ^0.13.4 => 0.13.4 
    lodash.isequal: ^4.5.0 => 4.5.0 
    mailgun.js: ^4.0.0 => 4.0.0 
    nanoid: ^3.1.30 => 3.1.30 
    node-cache: ^5.1.2 => 5.1.2 
    pusher: ^5.0.0 => 5.0.0 
    pusher-js: ^7.0.3 => 7.0.3 
    recaptcha-v3: ^1.10.0 => 1.10.0 
    sass: ^1.43.5 => 1.43.5 
    screenfull: ^6.0.0 => 6.0.0 
    shared: file:../shared => 1.1.0 
    svelte: ^3.44.2 => 3.44.2 
    svelte-calendar: ^2.0.4 => 2.0.4 
    svelte-preprocess: ^4.9.8 => 4.9.8 
    swiper: ^7.3.1 => 7.3.1 
    xmlbuilder2: ^3.0.2 => 3.0.2

Severity

blocking an upgrade

Additional Information

No response

[antony]

Duplicate of #2909