[svelte-query] createQueries crashes when the several items are removed from the array simultaneously

[Doverstav]

Describe the bug

When using createQueries, changes to the array where two or more items are removed simultaneously causes a crash with the following error:

TypeError: can't delete property '3': proxy deleteProperty handler returned false

  in $effect.pre
  in FilterDrawer.svelte
  in ListPage.svelte
  in index.svelte
  in AnchorDecorator.svelte
  in ScrollDecorator.svelte
  in DecoratorWrapper.svelte
  in RenderFragment.svelte
  in ComposeFragments.svelte
  in Noop.svelte
  in AnchorDecorator.svelte
  in ScrollDecorator.svelte
  in DecoratorWrapper.svelte
  in RenderFragment.svelte
  in ComposeFragments.svelte
  in AnchorDecorator.svelte
  in Router.svelte
  in QueryClientProvider.svelte
  in App.svelte

Your minimal, reproducible example

https://svelte.dev/playground/2b60862d9c564cd1b211738f60e6b729?version=5.55.0

Steps to reproduce

1. Go to the linked example
2. Try adding one or several elements to the array using the buttons, notice that it works
3. Try removing a single element using the button, this also works
4. Then try removing two items using the buttons, the page will now crash. Using slice() or splice() makes no difference. (the console in svelte playground isn't great, you'll have to open the console in the browser to see the error proper)

Expected behavior

I expect useQueries to update its result with fewer queries made, but instead it crashes.

How often does this bug happen?

Every time

Screenshots or Videos

createQueriesCrash.mp4

Platform

• OS: Windows
• Browser: Firefox 148.0.2

Tanstack Query adapter

svelte-query

TanStack Query version

v6.1.10

TypeScript version

v5.9.3

Additional context

No response