inherit a MapFrom from an indirect base class

Author: lbargaoanu

src/AutoMapper/TypeMap.cs

@@ -305,7 +305,8 @@ public void Seal(IGlobalConfiguration configuration, TypeMap thisMap)
             {
                 foreach (var inheritedTypeMap in InheritedTypeMaps)
                 {
-                    var includedMaps = inheritedTypeMap?._details?.IncludedMembersTypeMaps;
+                    inheritedTypeMap.Seal(configuration);
+                    var includedMaps = inheritedTypeMap._details?.IncludedMembersTypeMaps;
                     if (includedMaps != null)
                     {
                         IncludedMembersTypeMaps ??= new();

src/UnitTests/MappingInheritance/IncludedMappingShouldInheritBaseMappings.cs

@@ -1,5 +1,34 @@
 namespace AutoMapper.UnitTests;
-
+public class IncludeBaseIndirectBase : AutoMapperSpecBase
+{
+    public class FooBaseBase
+    {
+    }
+    public class FooBase : FooBaseBase
+    {
+    }
+    public class Foo : FooBase
+    {
+    }
+    public class FooDtoBaseBase
+    {
+        public DateTime Date { get; set; }
+    }
+    public class FooDtoBase : FooDtoBaseBase
+    {
+    }
+    public class FooDto : FooDtoBase
+    {
+    }
+    protected override MapperConfiguration CreateConfiguration() => new(c =>
+    {
+        c.CreateMap<Foo, FooDto>().IncludeBase<FooBase, FooDtoBase>();
+        c.CreateMap<FooBase, FooDtoBase>().IncludeBase<FooBaseBase, FooDtoBaseBase>();
+        c.CreateMap<FooBaseBase, FooDtoBaseBase>().ForMember(d => d.Date, o => o.MapFrom(s => DateTime.MaxValue));
+    });
+    [Fact]
+    public void Should_work() => Map<FooDto>(new Foo()).Date.ShouldBe(DateTime.MaxValue);
+}
 public class ReadonlyCollectionPropertiesOverride : AutoMapperSpecBase
 {
     protected override MapperConfiguration CreateConfiguration() => new(cfg =>