diff --git a/command/format/diff.go b/command/format/diff.go
index 0d641c301..049f62543 100644
--- a/command/format/diff.go
+++ b/command/format/diff.go
@@ -122,16 +122,6 @@ func ResourceChange(
 		panic(fmt.Sprintf("failed to decode plan for %s while rendering diff: %s", addr, err))
 	}
 
-	// We currently have an opt-out that permits the legacy SDK to return values
-	// that defy our usual conventions around handling of nesting blocks. To
-	// avoid the rendering code from needing to handle all of these, we'll
-	// normalize first.
-	// (Ideally we'd do this as part of the SDK opt-out implementation in core,
-	// but we've added it here for now to reduce risk of unexpected impacts
-	// on other code in core.)
-	changeV.Change.Before = objchange.NormalizeObjectFromLegacySDK(changeV.Change.Before, schema)
-	changeV.Change.After = objchange.NormalizeObjectFromLegacySDK(changeV.Change.After, schema)
-
 	bodyWritten := p.writeBlockBodyDiff(schema, changeV.Before, changeV.After, 6, path)
 	if bodyWritten {
 		buf.WriteString("\n")