Steplist seperator does not to work with dynamic steps

[DaSchTour]

Describe the bug

If the steps are created from a list the step seperator does not show up

Pull Request Link

#17483

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://github.com/DaSchTour/primeng-bugs/tree/main/src/app/stepper

Environment

Independent of the environment

Angular version

19

PrimeNG version

v19

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

Create a list of steps and step panels dynamically

Expected behavior

The step seperator is correctly displayed