Computed Height does not work with Screen Start/Open

https://x.thunkable.com/copy/aa0a8e3bc799580da25b148dd4733c04
If some kind soul can make this work I would be grateful.
All I want is when the screen starts or opens I have the Computed Height. There have been lot of discussion on this from way back 2019 but no solution. I hope 2024 has a solution or a workaround. Thanks

I found a workaround. All I did was put a Wait delay for 1 sec. It consistently works. Problem solved. I shall leave it here so that someone else might benefit from this. I have included the link to the program but Thunkable has some issues: oEmbed / OpenGraph tags could not be found …
https://x.thunkable.com/copy/d01564efc38cf7f15ab736c0345c6c2f
Hence here is the image