SerializationException on ListField ViewModels

[Sumo20]

Describe the bug
After installing the package we are getting this error on the CD server. how can i fix this. We are using sitecore 9.3 it was fixed in the ver 4.02 release for sitecore 10.1 ver [Serializable] was added to the CheckBoxListWithBindingsViewModel and other ones. The older versions do not have the [Serializable] . it is breaking the forms. How can we fix this

A clear and concise description of what the bug is.
Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects,
and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization
is done by the custom session state store in 'Custom' mode.
Source: System.Web
at System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer)
at System.Web.SessionState.SessionStateItemCollection.WriteValueToStreamWithAssert(Object value, BinaryWriter writer)
at System.Web.SessionState.SessionStateItemCollection.Serialize(BinaryWriter writer)
at Sitecore.SessionProvider.SessionStateSerializer.Serialize(BinaryWriter writer, SessionStateStoreData item)
at Sitecore.SessionProvider.SessionStateSerializer.Compress(SessionStateStoreData item)
at Sitecore.SessionProvider.SessionStateSerializer.Serialize(SessionStateStoreData sessionState, Boolean compress)
at Sitecore.SessionProvider.Sql.SqlSessionStateStore.UpdateAndReleaseItem(Guid application, String id, String lockCookie, SessionStateActions action, SessionStateStoreData sessionState)
at Sitecore.SessionProvider.Sql.SqlSessionStateProvider.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData sessionState, Object lockId, Boolean newItem)
at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Nested Exception

Exception: System.Runtime.Serialization.SerializationException
Message: Type 'Feature.FormsExtensions.Fields.Bindings.ListWithBindingsViewModel' in Assembly 'Feature.FormsExtensions, Version=3.2.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.
Source: mscorlib
at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type)
at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory)
at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector,
StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.WriteArrayMember(WriteObjectInfo objectInfo, NameInfo arrayElemTypeNameInfo, Object data)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.WriteArray(WriteObjectInfo objectInfo, NameInfo memberNameInfo, WriteObjectInfo memberObjectInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
at System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer)

It is missing the attributes
CheckBoxListWithBindingsViewModel
DropDownWithBindingsViewModel
ListBoxWithBindingsViewModel
ListWithBindingsViewModel