DatePicker: `open` state keeps getting set to `true`

[Duckapple]

Describe the bug

In my Svelte app, my date picker implementation requires accepting and emitting date-objects from dayjs. So far, it has worked well, using some effects to sync the bound prop value to an internalValue $state which is bound to the DatePicker.Root.

After a dependency update, the date picker suddenly didn't want to close the picker when the user chooses a date, even when closeOnDateSelect is either unset or set to true. This didn't update the effect, and so the input is broken.

The problem appeared while I was trying to bump the version from 2.9.4 to latest. Bumping back, I found out the problem was introduced in 2.9.6.

I was able to see that onOpenChange still works correctly, calling ={console.log} with false when picking a value, the issue is with the bound open prop.

(I'll add the repro later today)

Reproduction

I'll add the repro later today

Logs

System Info

System:
    OS: Linux 6.8 Ubuntu 24.04.3 LTS 24.04.3 LTS (Noble Numbat)
    CPU: (16) x64 AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics
    Memory: 26.73 GB / 61.45 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 24.8.0 - ~/.local/share/pnpm/node
    npm: 11.6.0 - ~/.local/share/pnpm/npm
    pnpm: 10.17.1 - ~/.local/share/pnpm/pnpm


  @sveltejs/kit: 2.36.3
  svelte: 5.35.7
  dayjs: 1.11.18

Severity

blocking an upgrade