[MyvTsv]

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !46829 & !47460 & !46413
• Here is a brief description of what this PR does

When an item with a filled mandatory field is created with an assigned technician, the Some mandatory fields are empty error is displayed although the value is saved, and the ticket stays in the New status instead of Processing (assigned).

Steps to reproduce

1. Go to Setup > Additional fields and create a block:
   • Type: Insertion in the form
   • Associated item type: Ticket
2. In this block, add a Text field named Tel and check Mandatory field.
3. Go to Assistance > Tickets > Create ticket.
4. Fill the title, the description and the Tel field.
5. In the Actors section, add a technician in Assigned to.
6. Click Add.

[Mary-Clb]

@MyvTsv I did the same fix on #1337 and #1338 : I close both in favor of yours because you did this one first.