Combining transitions and animations causes flicker since .8 update

[IdrisCelik]

Describe the bug

After #17150 there is flickering (refresh if you missed it) when combining transition (for animating in) and animate:flip (for when reordering happens). This did not happen prior to this PR. It would be great if this gets fixed.

Reproduction

https://svelte.dev/playground/053581b4d5914c37b1e42ac1cb245e8b?version=5.43.7 here it works

https://svelte.dev/playground/57cba6ae82a648b587daf6733dd9892b?version=pr-17150 here it got broken

Logs

System Info

System:
    OS: Windows 11 10.0.26100
    CPU: (16) x64 AMD Ryzen 7 7840HS w/ Radeon 780M Graphics     
    Memory: 2.08 GB / 15.29 GB
  Binaries:
    Node: 24.11.0 - C:\nvm4w\nodejs\node.EXE
    npm: 11.6.1 - C:\nvm4w\nodejs\npm.CMD
    pnpm: 10.23.0 - C:\Users\micro\AppData\Local\pnpm\pnpm.CMD
  Browsers:
    Chrome: 142.0.7444.176
    Edge: Chromium (139.0.3405.102)
  npmPackages:
    svelte: ^5.43.14 => 5.43.14

Severity

blocking an upgrade