diff --git a/.chronus/changes/prevent_breaking-2024-1-28-17-11-9.md b/.chronus/changes/prevent_breaking-2024-1-28-17-11-9.md
new file mode 100644
index 0000000000..b7560c3c11
--- /dev/null
+++ b/.chronus/changes/prevent_breaking-2024-1-28-17-11-9.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+rollback some of the breaking changes for common model types method
\ No newline at end of file
diff --git a/packages/typespec-client-generator-core/src/decorators.ts b/packages/typespec-client-generator-core/src/decorators.ts
index aa038bf499..d5baeb834b 100644
--- a/packages/typespec-client-generator-core/src/decorators.ts
+++ b/packages/typespec-client-generator-core/src/decorators.ts
@@ -17,7 +17,6 @@ import {
   UsageFlags,
   getNamespaceFullName,
   getProjectedName,
-  ignoreDiagnostics,
   isService,
   isTemplateDeclaration,
   isTemplateDeclarationOrInstance,
@@ -740,7 +739,7 @@ export function getUsage(context: TCGCContext, entity: Model | Enum): UsageFlags
     getAllModels(context); // this will populate modelsMap
   }
   return entity.kind === "Model"
-    ? ignoreDiagnostics(getSdkModel(context, entity)).usage
+    ? getSdkModel(context, entity).usage
     : getSdkEnum(context, entity).usage;
 }
 
@@ -783,7 +782,7 @@ export function getAccess(
   }
 
   return entity.kind === "Model"
-    ? ignoreDiagnostics(getSdkModel(context, entity)).access
+    ? getSdkModel(context, entity).access
     : getSdkEnum(context, entity).access;
 }
 
diff --git a/packages/typespec-client-generator-core/src/types.ts b/packages/typespec-client-generator-core/src/types.ts
index 2aa499c271..59d2e8c63d 100644
--- a/packages/typespec-client-generator-core/src/types.ts
+++ b/packages/typespec-client-generator-core/src/types.ts
@@ -271,6 +271,14 @@ export function getSdkArrayOrDict(
   context: TCGCContext,
   type: Model,
   operation?: Operation
+): (SdkDictionaryType | SdkArrayType) | undefined {
+  return ignoreDiagnostics(getSdkArrayOrDictWithDiagnostics(context, type, operation));
+}
+
+export function getSdkArrayOrDictWithDiagnostics(
+  context: TCGCContext,
+  type: Model,
+  operation?: Operation
 ): [(SdkDictionaryType | SdkArrayType) | undefined, readonly Diagnostic[]] {
   const diagnostics = createDiagnosticCollector();
   if (type.indexer !== undefined) {
@@ -306,6 +314,14 @@ export function getSdkTuple(
   context: TCGCContext,
   type: Tuple,
   operation?: Operation
+): SdkTupleType {
+  return ignoreDiagnostics(getSdkTupleWithDiagnostics(context, type, operation));
+}
+
+export function getSdkTupleWithDiagnostics(
+  context: TCGCContext,
+  type: Tuple,
+  operation?: Operation
 ): [SdkTupleType, readonly Diagnostic[]] {
   const diagnostics = createDiagnosticCollector();
   return diagnostics.wrap({
@@ -320,7 +336,11 @@ function getNonNullOptions(context: TCGCContext, type: Union): Type[] {
   return [...type.variants.values()].map((x) => x.type).filter((t) => !isNullType(t));
 }
 
-export function getSdkUnion(
+export function getSdkUnion(context: TCGCContext, type: Union, operation?: Operation): SdkType {
+  return ignoreDiagnostics(getSdkUnionWithDiagnostics(context, type, operation));
+}
+
+export function getSdkUnionWithDiagnostics(
   context: TCGCContext,
   type: Union,
   operation?: Operation
@@ -379,7 +399,9 @@ function addDiscriminatorToModelType(
   if (discriminator) {
     let discriminatorProperty;
     for (const childModel of type.derivedModels) {
-      const childModelSdkType = diagnostics.pipe(getSdkModel(context, childModel, operation));
+      const childModelSdkType = diagnostics.pipe(
+        getSdkModelWithDiagnostics(context, childModel, operation)
+      );
       updateModelsMap(context, childModel, childModelSdkType, operation);
       for (const property of childModelSdkType.properties) {
         if (property.kind === "property") {
@@ -460,6 +482,14 @@ export function getSdkModel(
   context: TCGCContext,
   type: Model,
   operation?: Operation
+): SdkModelType {
+  return ignoreDiagnostics(getSdkModelWithDiagnostics(context, type, operation));
+}
+
+export function getSdkModelWithDiagnostics(
+  context: TCGCContext,
+  type: Model,
+  operation?: Operation
 ): [SdkModelType, readonly Diagnostic[]] {
   const diagnostics = createDiagnosticCollector();
   type = getEffectivePayloadType(context, type);
@@ -689,12 +719,12 @@ export function getClientTypeWithDiagnostics(
       retval = getSdkConstant(context, type);
       break;
     case "Tuple":
-      retval = diagnostics.pipe(getSdkTuple(context, type, operation));
+      retval = diagnostics.pipe(getSdkTupleWithDiagnostics(context, type, operation));
       break;
     case "Model":
-      retval = diagnostics.pipe(getSdkArrayOrDict(context, type, operation));
+      retval = diagnostics.pipe(getSdkArrayOrDictWithDiagnostics(context, type, operation));
       if (retval === undefined) {
-        retval = diagnostics.pipe(getSdkModel(context, type, operation));
+        retval = diagnostics.pipe(getSdkModelWithDiagnostics(context, type, operation));
       }
       break;
     case "Intrinsic":
@@ -736,7 +766,7 @@ export function getClientTypeWithDiagnostics(
       if (unionAsEnum && type.name) {
         retval = getSdkUnionEnum(context, unionAsEnum, operation);
       } else {
-        retval = diagnostics.pipe(getSdkUnion(context, type, operation));
+        retval = diagnostics.pipe(getSdkUnionWithDiagnostics(context, type, operation));
       }
       break;
     case "ModelProperty":
diff --git a/packages/typespec-client-generator-core/test/public-utils.test.ts b/packages/typespec-client-generator-core/test/public-utils.test.ts
index bd08aace4c..2460a888d6 100644
--- a/packages/typespec-client-generator-core/test/public-utils.test.ts
+++ b/packages/typespec-client-generator-core/test/public-utils.test.ts
@@ -1325,9 +1325,7 @@ describe("typespec-client-generator-core: public-utils", () => {
         }
         `)) as { repeatabilityResult: ModelProperty };
 
-        const union = ignoreDiagnostics(
-          getSdkUnion(runner.context, repeatabilityResult.type as Union)
-        );
+        const union = getSdkUnion(runner.context, repeatabilityResult.type as Union);
         strictEqual(
           (union as SdkUnionType).generatedName,
           "ResponseWithAnonymousUnionRepeatabilityResult"
@@ -1350,9 +1348,7 @@ describe("typespec-client-generator-core: public-utils", () => {
         }
         `)) as { repeatabilityResult: ModelProperty };
 
-        const union = ignoreDiagnostics(
-          getSdkUnion(runner.context, repeatabilityResult.type as Union)
-        );
+        const union = getSdkUnion(runner.context, repeatabilityResult.type as Union);
         strictEqual(
           (union as SdkUnionType).generatedName,
           "RequestParameterWithAnonymousUnionRepeatabilityResult"
@@ -1375,9 +1371,7 @@ describe("typespec-client-generator-core: public-utils", () => {
         }
         `)) as { repeatabilityResult: ModelProperty };
 
-        const stringType = ignoreDiagnostics(
-          getSdkUnion(runner.context, repeatabilityResult.type as Union)
-        )!;
+        const stringType = getSdkUnion(runner.context, repeatabilityResult.type as Union)!;
         strictEqual(stringType.kind, "union");
         strictEqual(stringType.values.length, 3);
         strictEqual(stringType.values[0].kind, "constant");