Iaroslav Lakhin

AsyncInstantiateOperation was added since Unity 2022.3.20 / 2023.3.0b7: - https://unity.com/releases/editor/whats-new/2022.3.20 - https://unity.com/releases/editor/beta I didn't find a define like UNITY_2022_3_20_OR_NEWER to restrict the methods.

Unity 2022.3.19f1 does not support this API. It was added in a patch version (https://unity.com/releases/editor/whats-new/2022.3.20).