Sounds like neither Multiviewport nor View Instancing (MMV) is not supported on Mac atm, and the logic in StereoAspects asserts. See attached log from a partner.
1) Enable Instanced Stereo settings in the project
2) Open it in Mac editor
Observe crash
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-174004 in the post.
| 1 |
| Component | UE - Platform - XR |
|---|---|
| Affects Versions | 5.1, 5.2, 5.3 |
| Target Fix | 5.3 |
| Created | Jan 12, 2023 |
|---|---|
| Resolved | Aug 1, 2023 |
| Updated | Aug 8, 2023 |