When committing a fork derived seem to be read out of order in some cases.

Describe the bug

With forking enabled a 'disabled' bits-ui tooltip will read a derived value that is no longer valid.

issue is not present without forking.

I initially found this error when using the forkPreloads option in sveltekit, when navigating away from a page with a disabled tool tip where the tooltip depends on a derived value the page would show an error boundary.

i was unable to replicate without bits-ui, but i am inclined to believe this is a svelte issues based on the error only appearing with forking enabled.

[!NOTE]
without the error boundary the error is still thrown and logged to the console, but the application continues to work. its possible this is actually just the boundary catching the error from a fork when it shouldn't but it seems odd the exception would be present at all.

Reproduction

https://svelte.dev/playground/5fbf63a8ae1c4fc98e24d28616491ee3?version=5.56.4

there is a disabled bits-ui tooltip with 2 buttons below.

button on the left will create a fork clearing the lines and allow you to commit.
upon commit the boundary will trigger and an error will appear in the console.

if you reset and click the button on the right the lines are cleared without a fork. no error present.
you can reset and try again.

Logs

{ message: "Line with id 2 not found" ,data: undefined }
TypeError
TypeError: Cannot read properties of null (reading 'error')
    at invoke_error_boundary (playground:output:1350:41)
    at handle_error (playground:output:1330:3)
    at update_reaction (playground:output:5824:11)
    at execute_derived (playground:output:2511:13)
    at get (playground:output:6083:14)
    at get disabled (playground:output:12168:29)
    at getter (playground:output:8847:40)
    at eval (playground:output:11964:28)
    at get current (playground:output:9077:12)
    at #register (playground:output:11622:40)

System Info

System:
    OS: Linux 6.18 Ubuntu 22.04.5 LTS 22.04.5 LTS (Jammy Jellyfish)
    CPU: (32) x64 13th Gen Intel(R) Core(TM) i9-13900
    Memory: 15.45 GB / 31.19 GB
    Container: Yes
    Shell: 5.1.16 - /bin/bash
  Binaries:
    Node: 20.18.0 - /home/jayce/.nvm/versions/node/v20.18.0/bin/node
    npm: 10.8.2 - /home/jayce/.nvm/versions/node/v20.18.0/bin/npm
    pnpm: 10.18.0 - /home/jayce/.local/share/pnpm/pnpm
    bun: 1.1.15 - /mnt/c/Users/jjones/AppData/Roaming/npm/bun

Severity

annoyance