App Tour with ngx-joyride library non works on ios

Hi all,
I integrated ngx-joyride library on my app because I need to create a tour at first execution.

It works on web browser and android device but It not works on ios simulator.

The app start, tour starts but it is blocked on step 1. Not show popup with message and buttons to close or go to the next step. App is freezed

The problem occurs when I attach a step to some specific elements of the page that are built with css.

If I insert a simple header <h1> or a paragraph <p>, the tour starts correctly.

Could you please help me?