Vue3: Bug with LabeledSelect with "multiple" attribute

[aalves08]

Setup

• Rancher version: Any + Vue3 frontend
• Rancher UI Extensions:
• Browser type & version:

Describe the bug

Using LabeledSelect with option multiple="true" is not working properly

To Reproduce

• Create some secrets of type kubernetes.io/dockercfg (at least a couple)
• Create Registry Secret if missing
• Go to Deployments -> Create -> go to the Pull Secrets select on the General tab and select an option

Result

• Throws an error

Expected Result

• Should work fine

Screenshots

Vue3 (fails)
https://github.com/user-attachments/assets/ede5a1ec-432a-4ba9-9562-1131ca6b5276

2.9-head (works)
https://github.com/user-attachments/assets/52ba106a-4e41-4921-8dca-515210b9d017

Additional context

I believe it's related to the option multiple="true"
https://vue-select.org/guide/values.html#single-multiple

If we add the attribute multiple to the v-select, the output is an array and it works fine, so the binding of the attributes is where the problem lies

[cnotv]

Note: This issue seems a recent regression since I had to pull master to reproduce it.

EDIT: Found regression: #11954