Ads don't work in iOS (but work when "Request desktop site" is on)

[Andekas]

Have you read the FAQ and checked for duplicate open issues?
Yes

If the problem is related to FairPlay, have you read the tutorial?

Not related

What version of Shaka Player are you using?

Latest, 4.7.1

Can you reproduce the issue with our latest release version?
Yes

Can you reproduce the issue with the latest code from main?
Yes

Are you using the demo app or your own custom app?
Tested with both

If custom app, can you reproduce the issue using our demo app?
Yes

What browser and OS are you using?
iOS, Safari, Chrome

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
Not related

What are the manifest and license server URIs?

Doesn't matter; for testing VMAP sample URLs from https://developers.google.com/interactive-media-ads/docs/sdks/html5/client-side/tags are good

What configuration are you using? What is the output of player.getConfiguration()?

Default

What did you do?

Play video with ads using iOS device (iPhone). For testing, I added IMA sample tag to some existing demo players.

What did you expect to happen?
Preroll to play.

What actually happened?

Video starts and ads don't even get loaded.

I know that Shaka doesn't support midrolls on iOS, but previously the preroll(s) started playing. An then, using adManager event listener for shaka.ads.AdManager.AD_STOPPED it was possible to reload player with intended content. This worked in 4.3.2

With current version, ads won't load at all.

Strangely, when "Request desktop site" is on, ads (even midrolls) work great on iOS, both Chrome and Safari.