Dynamically enhanced images have srcset with only 2 variants

Describe the bug

Hey 👋

I can't figure out how to dynamically enhance images properly. I've added ?enhanced part and images are processed into different formats. However, srcset has only 2 variants:

<script lang="ts">
  import bostonOverviewImage from '$lib/assets/images/boston-overview.jpg?enhanced'
</script>

<enhanced:img
  src={bostonOverviewImage}
  class="image"
  alt="boston overview"
  sizes="(width >= 700px) 500px, 100px"
/>

Images have different formats but srcset with 2 variants:

When importing same file directly with a path, images with multiple srcset are created:

<enhanced:img
  src="$lib/assets/images/boston-overview.jpg"
  class="image"
  alt="boston overview"
  sizes="(width >= 700px) 500px, 100px"
/>

Same image a lot more srcset variants:

What can be the reason?

I'd love to have the second variant but for ?enhanced images.
Tried importing using various variants from https://github.com/sveltejs/kit/issues/11535 with no luck.

Reproduction

https://github.com/vladshcherbin/svelte-lab

Can be run with standard pnpm dev (or other package manager)

Logs

No response

System Info

System:
  OS: macOS 14.4.1
  CPU: (8) arm64 Apple M2
  Memory: 73.22 MB / 8.00 GB
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 20.10.0 - /opt/homebrew/opt/node@20/bin/node
  pnpm: 8.15.6 - /opt/homebrew/opt/node@20/bin/pnpm
Browsers:
  Chrome: 123.0.6312.107
npmPackages:
  @sveltejs/adapter-vercel: ^5.2.0 => 5.2.0 
  @sveltejs/enhanced-img: ^0.2.0 => 0.2.0 
  @sveltejs/kit: ^2.5.5 => 2.5.5 
  @sveltejs/vite-plugin-svelte: ^3.0.2 => 3.0.2 
  svelte: ^4.2.12 => 4.2.12 
  vite: ^5.2.8 => 5.2.8

Severity

blocking an upgrade

Additional Information

No response

Start with the linked svelte-lab reproduction and run it with pnpm dev. Compare the srcset generated by enhanced:img for the ?enhanced import with the direct image-path import, then trace the @sveltejs/enhanced-img and Vite integration. Done means dynamically enhanced images produce the expected range of srcset variants.