diff --git a/plans/objchange/normalize_obj.go b/plans/objchange/normalize_obj.go
index 3e1eee815..baf799fec 100644
--- a/plans/objchange/normalize_obj.go
+++ b/plans/objchange/normalize_obj.go
@@ -34,6 +34,16 @@ func NormalizeObjectFromLegacySDK(val cty.Value, schema *configschema.Block) cty
 	}
 	for name, blockS := range schema.BlockTypes {
 		lv := val.GetAttr(name)
+
+		// Legacy SDK never generates dynamically-typed attributes and so our
+		// normalization code doesn't deal with them, but we need to make sure
+		// we still pass them through properly so that we don't interfere with
+		// objects generated by other SDKs.
+		if ty := blockS.Block.ImpliedType(); ty.HasDynamicTypes() {
+			vals[name] = lv
+			continue
+		}
+
 		switch blockS.Nesting {
 		case configschema.NestingSingle:
 			if lv.IsKnown() {
diff --git a/plans/objchange/normalize_obj_test.go b/plans/objchange/normalize_obj_test.go
index f95a0b460..abc9c3770 100644
--- a/plans/objchange/normalize_obj_test.go
+++ b/plans/objchange/normalize_obj_test.go
@@ -224,6 +224,74 @@ func TestNormalizeObjectFromLegacySDK(t *testing.T) {
 				}),
 			}),
 		},
+		"block list with dynamic type": {
+			&configschema.Block{
+				BlockTypes: map[string]*configschema.NestedBlock{
+					"a": {
+						Nesting: configschema.NestingList,
+						Block: configschema.Block{
+							Attributes: map[string]*configschema.Attribute{
+								"b": {Type: cty.DynamicPseudoType, Optional: true},
+							},
+						},
+					},
+				},
+			},
+			cty.ObjectVal(map[string]cty.Value{
+				"a": cty.TupleVal([]cty.Value{
+					cty.ObjectVal(map[string]cty.Value{
+						"b": cty.StringVal("hello"),
+					}),
+					cty.ObjectVal(map[string]cty.Value{
+						"b": cty.True,
+					}),
+				}),
+			}),
+			cty.ObjectVal(map[string]cty.Value{
+				"a": cty.TupleVal([]cty.Value{
+					cty.ObjectVal(map[string]cty.Value{
+						"b": cty.StringVal("hello"),
+					}),
+					cty.ObjectVal(map[string]cty.Value{
+						"b": cty.True,
+					}),
+				}),
+			}),
+		},
+		"block map with dynamic type": {
+			&configschema.Block{
+				BlockTypes: map[string]*configschema.NestedBlock{
+					"a": {
+						Nesting: configschema.NestingMap,
+						Block: configschema.Block{
+							Attributes: map[string]*configschema.Attribute{
+								"b": {Type: cty.DynamicPseudoType, Optional: true},
+							},
+						},
+					},
+				},
+			},
+			cty.ObjectVal(map[string]cty.Value{
+				"a": cty.ObjectVal(map[string]cty.Value{
+					"one": cty.ObjectVal(map[string]cty.Value{
+						"b": cty.StringVal("hello"),
+					}),
+					"another": cty.ObjectVal(map[string]cty.Value{
+						"b": cty.True,
+					}),
+				}),
+			}),
+			cty.ObjectVal(map[string]cty.Value{
+				"a": cty.ObjectVal(map[string]cty.Value{
+					"one": cty.ObjectVal(map[string]cty.Value{
+						"b": cty.StringVal("hello"),
+					}),
+					"another": cty.ObjectVal(map[string]cty.Value{
+						"b": cty.True,
+					}),
+				}),
+			}),
+		},
 	}
 
 	for name, test := range tests {