Custom properties values are copied from one field to another

[OmranAbazid]

Describe the Bug

Custom properties values are copied from one field to another, if you switch between fields while focusing on the value of one of them.

Steps to Reproduce

1. In the form js, create two text fields
2. Add a custom property to each one of them to give it a different value
3. focus on the value input field of the created custom property
4. Now click on the second text field
5. You will select that the value of the first field's custom property is copied into the second one

Expected Behavior

• Each field will still contain a different value for the custom field.

Environment

• Host Chrome latest
• OS: MacOS 15.5
• Library version: v1.17

Context

related to SUPPORT-29064

[marcosgvieira]

@OmranAbazid can you please take care of this fix, I would like more engineers to be able to maintain Form-Js. @vsgoulart can onboard you on that.