Transition: newly applied options aren't reflected if a new transition is fired when another is in progress

[F-fengzi]

Describe the bug

Using Svelte transitions, if a transition's property is changed and fired again while there is a previous transition playing (e.g. out transition fired during in transition), the newly changed property isn't reflected.

Reproduction

I think this demonstration explains the problem quite well:
https://svelte.dev/playground/5f6689dc57124b308150cbcc7e55e298?version=5.25.6

Logs

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (12) x64 AMD Ryzen 5 3600 6-Core Processor
    Memory: 16.49 GB / 31.89 GB
  Binaries:
    Node: 20.17.0 - C:\Program Files\nodejs\node.EXE
    npm: 11.2.0 - C:\Program Files\nodejs\npm.CMD
    pnpm: 9.12.2 - ~\AppData\Local\pnpm\pnpm.EXE
    bun: 1.2.7 - ~\.bun\bin\bun.EXE
  Browsers:
    Edge: Chromium (128.0.2739.79)
    Internet Explorer: 11.0.22621.3527
  npmPackages:
    svelte: ^5.25.7 => 5.25.7

Severity

annoyance