How to reproduce:
1. Open the attached project “IN-138223”
2. Press Assets -> Reimport All
3. Observe the Console window
Actual result: "The type Unity.Localization UnityEngine.Localization.Metadata.SmartFormatTag is being serialized by [SerializeReference], but its parent type Unity.Localization UnityEngine.Localization.Metadata.SharedTableEntryMetadata is missing the [Serializable] attribute." warning is thrown
Expected result: No warnings are thrown
Reproducible with: 1.5.4 (6000.4.0a1), 1.5.11 (6000.4.0a1, 6000.6.0a5)
Not reproducible with: 1.5.11 (6000.3.0a6)
Reproducible on: Windows 11
Not reproducible on: No other environments tested