Hi, I have the two issues with Unity 2020.3.0f1. I will try to send a bug report, but it will take a very long time.
OperationException : SelectedLocale is null
UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1/<>c__DisplayClass57_0<UnityEngine.Localization.Settings.LocalizationSettings>:<add_CompletedTypeless>b__0 (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Settings.LocalizationSettings>)
DelegateList`1<UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Settings.LocalizationSettings>>:Invoke (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Settings.LocalizationSettings>) (at Library/PackageCache/com.unity.addressables@1.18.15/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.Localization.InitializationOperation:<LoadLocales>b__10_0 (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>)
DelegateList`1<UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>>:Invoke (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>) (at Library/PackageCache/com.unity.addressables@1.18.15/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.ResourceManagement.ChainOperationTypelessDepedency`1<UnityEngine.Localization.Locale>:OnWrappedCompleted (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>)
DelegateList`1<UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>>:Invoke (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1<UnityEngine.Localization.Locale>) (at Library/PackageCache/com.unity.addressables@1.18.15/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.Localization.Components.LocalizeStringEvent:OnEnable () (at Library/PackageCache/com.unity.localization@1.0.0-pre.10/Runtime/Component Localizers/LocalizeStringEvent.cs:81)
System.Exception: SelectedLocale is null
UnityEngine.Localization.Components.LocalizeStringEvent:OnEnable () (at Library/PackageCache/com.unity.localization@1.0.0-pre.10/Runtime/Component Localizers/LocalizeStringEvent.cs:81)
These issues are repeated many times: