Svelte 5: reactive statements migration error

[Specy]

Describe the bug

When using reactive statements in svelte 4, like: $: $store.count = count (i use this to keep synchronized the value of a store with a local variable), the svelte 5 migration script converts this as: let $store.count = $derived(count)

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACmWQ3WrDMAyFX0WIQhMW2u42bQp7hl3Ou0hdBdwmcrCV_WD87sNukxZ2ZXx0dCR9ATvTk8f6IyC3A2GNb-OIFcrvmD7-i3ohrNDbyemkHLx2ZpSjYiVmGK0TCEN7pXexjiJ0zg6w3mx9-m4ufp182rIXyBI0sLiLMhV7EtB2YoEGdoqT1E2sxVgGw9rRQCxFCSFVUlayvjTwuk9CzB2sZFXD6jZ0Dsuv4sP2sTEfTpOIZbCse6OvTVgmxHxRVn0N4TkrppBb4xErHOzZdIbOWIubKFYLudzyYHfxz9xmVt_OSHvqZ1TqjvgGTOH-fg_TT_YvKJ6oZRKOZHIMc1wR8qo17GKpOP5f8zP-AbLDFqbsAQAA

Logs

No response

System Info

System:
    OS: Windows 11 10.0.27723
    CPU: (12) x64 Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
    Memory: 2.31 GB / 15.82 GB
  Binaries:
    Node: 22.2.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.7.0 - C:\Program Files\nodejs\npm.CMD
    bun: 1.1.30 - ~\.bun\bin\bun.EXE
  Browsers:
    Edge: Chromium (130.0.2849.35), ChromiumDev (121.0.2277.4)
    Internet Explorer: 11.0.27723.1000

Severity

blocking an upgrade