mediasoup-demo does not work correctly SVC with vp9

Hi @ibc . I noticed that the website mediasoup-demo does not work correctly with SVC vp9 on iPhone safari (chrome). I attach screenshots should it work like this or I don’t understand something?

this is a screenshot from a chrome laptop where you can see how I connected via iPhone and it sends the bitrate only to the 1st level.

this is a local screen from the iPhone where it is also only at level 1.

and this screen of the local laptop of the temple where it normally processes all levels correctly.

and I will also attach a screen from the chrome laptop from the iPhone, which also sends all levels correctly. is this how it should work with an iPhone? Or is there some misunderstanding?
On samsung android chrome, it handles all levels as well as on a laptop. Problem on iphone.