This extension appears to throw an exception whenever it is used with EF Core 2.1 - I am using "v2.1.0-rc1-final" of Pomelo EntityFrameworkCore MySql.
System.TypeInitializationException: The type initializer for 'Pomelo.EntityFrameworkCore.Lolita.ReflectionCommon' threw an exception. ---> System.InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at Pomelo.EntityFrameworkCore.Lolita.ReflectionCommon..cctor()