Right now it seems that the Sqlite and the SqlServer plugins does not support SerializerWithStringManifest.

See: https://github.com/akkadotnet/akka.net/blob/dev/src/contrib/persistence/Akka.Persistence.Sqlite.Tests/Serialization/SqliteJournalSerializationSpec.cs#L51 For Sqlite.

The current SqlServer plugin is being updated to 1.3. See: akkadotnet/Akka.Persistence.SqlServer#73
However that PR still does not support SerializerWithStringManifest.

Support for SerializerWithStringManifest is important. Because cluster sharding demands it. So right now using cluster sharding in combination with the Sql plugins will cause problems.