We hit the exact same ensure (OverriddenPropertySet.cpp, “Incorrect owner passed. Scopes are mismatching!”) from a different trigger: cloning a Button device (Ctrl+D or copy-paste) instead of Alt-drag on a custom Prefab. In our case it escalates into a reproducible EXCEPTION_ACCESS_VIOLATION crash. Looks like the same root cause (owner/scope mismatch when duplicating an actor with overridden properties) across different clone paths. Full repro + logs here: Duplicating/copy-pasting a Button device corrupts its Timeline component and crashes the editor (reproducible EXCEPTION_ACCESS_VIOLATION)