Some versions of Unity or Unity plugins have known incompatibilities blocking apps from working as expected on HoloLens 2 or Windows Mixed Reality devices. While we generally support all LTS versions of Unity and their verified plugins, we recommend avoiding those specific builds of Unity and Unity plugins to ensure your apps work as expected.
| Blocking issues | Status & Last Update | Versions with issue | Mitigation |
|---|---|---|---|
| HL2 app using URP has worse render performance in Unity 2021 compared to Unity 2020. | Investigating: 2022/08/29 |
Unity 2021.*.* with URP 12.*.* |
Either avoid URP in Unity 2021 or use URP in Unity 2020.LTS |
| Blocking issues | Status & Last Update | Versions with issue | Versions with fixes |
|---|---|---|---|
| Building application via IL2CPP in Unity fails due to compilation errors. For more information on the root cause, refer to the discussion here. | Fixed: 2022/11/10 |
Visual Studio 2022 version 17.4+ with Unity versions «br />2020.3.42f1, 2021.3.14f1, 2022.1.23f1, 2022.2.0b16 and 2023.1.0a19 |
Use Visual Studio 2019 or Unity version >= 2020.3.42f1, 2021.3.14f1, 2022.1.23f1, 2022.2.0b16 or 2023.1.0a19 |
| Holographic App Remoting remoting app using Unity’s OpenXR plugin 1.5.1 fails to connect to remoting player if the hosting PC doesn’t have other VR headsets attached. | Fixed: 2022/10/04 |
Unity 2020 or Unity 2021 with Unity OpenXR plugin = 1.5.0, 1.5.1 and 1.5.2 |
If using Holographic App Remoting, use Unity OpenXR plugin <= 1.4.3 or >= 1.5.3 |
| ARM32 UWP Unity apps built in release mode using Visual Studio 2022 will hit an internal compiler error in Visual Studio. | Fixed: 2022/08/09 |
Visual Studio 2022 version 17.1.1+ |
Use Visual Studio 2019 or Visual Studio 2022 version >= 17.3.* |
| HL2 app using URP, WindowsXR plugin and Gamma color space rendering has worse render performance in Unity 2020 or later. | Fixed: 2022/06/15 |
Unity 2020.*.* with URP 10.*.* and Windows XR Plugin <=4.6.3 |
Use Windows XR Plugin version >= 4.6.4 |
| HL2 app using Unity’s Burst package (e.g. commonly used when using URP) will hit ILCPP compile error in VisualStudio. | Fixed: 2022/06/06 |
Unity Burst package 1.6.5, 1.7.0 or 1.7.1 |
Use Unity Burst package 1.6.6 or 1.7.2 or later versions. |
| Application with default splash screen will show four spinning dots when launching on HL2, or after the application is suspended and resumed. | Fixed: 2022/05/20 |
Unity 2020.3.32-34f1 </br>and Unity 2021.2.17~19f1 and Unity 2021.3.0~3f1 | Use Unity 2020.3.35f1 or Unity 2021.3.4f1 or later |
| HL2 application shows severely jittery image. | Fixed: 2021/12/02 |
Unity 2020.3.21f1 to Unity 2020.3.23f1 |
Use Unity 2020.3.24f1 and later |
| OpenXR backend with URP can deadlock on HL2. | Fixed: 2021/05/13 |
Unity 2020.3.0f1 to Unity 2020.3.7f1 |
Use Unity 2020.3.8f1 and later |