ARFoundation Collaboration Data incompatible between iOS 16 and all previous iOS versions

Question

Created Jul ’22

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After upgrading my iPhone 12 to iOS 16 and leaving my iPhone XS on 15.5, I launched ARFoundation Samples project into AR Collaboration scene, and as soon as the devices connected to each other, the 15.5 iOS device would crash..

ARFoundation Samples Repo:

https://github.com/Unity-Technologies/arfoundation-samples

I confirmed this with multiple devices and settings:

iPhone 12 Pro iOS 16 <-> iPhone XS iOS 15.5 (CRASH)
iPhone 12 Pro iOS 16 <-> iPhone 7 iOS 14.3 (CRASH)
iPhone 12 Pro iOS 16 <-> iPhone SE iOS 15.5 (CRASH)
iPhone XS iOS 15.5 <-> iPhone SE iOS 15.5 (NO CRASH)
iPhone XS iOS 15.5 <-> iPhone 7 iOS 14.3 (NO CRASH)
iPhone XS Upgraded to iOS 16 <-> iPhone 12 pro iOS 16 (NO CRASH)
iPhone XS iOS 16 <-> iPhone SE iOS 15.5 (CRASH)
iPhone XS iOS 16 <-> iPhone 7 iOS 14.3 (CRASH)

Xcode Log:

Xcode Log

Xcode Version 14.0 beta 3 (14A5270f)

Editor : 2022.2

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Answer 1

Vision Pro Engineer OP

Apple

Jul ’22

Hi DiannaUnity,

Collaborative sessions on iOS 16 are not backwards compatible with older iOS versions. You would need to update all devices participating in the session to iOS 16. The crash is happening in Unity's code, so I would recommend filing a bug report with Unity about this issue.

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