diff --git a/x-pack/solutions/security/plugins/security_solution/common/api/detection_engine/prebuilt_rules/perform_rule_upgrade/perform_rule_upgrade_route.ts b/x-pack/solutions/security/plugins/security_solution/common/api/detection_engine/prebuilt_rules/perform_rule_upgrade/perform_rule_upgrade_route.ts
index 3ef53e7b7c67a..ac75bbb56e0bf 100644
--- a/x-pack/solutions/security/plugins/security_solution/common/api/detection_engine/prebuilt_rules/perform_rule_upgrade/perform_rule_upgrade_route.ts
+++ b/x-pack/solutions/security/plugins/security_solution/common/api/detection_engine/prebuilt_rules/perform_rule_upgrade/perform_rule_upgrade_route.ts
@@ -26,7 +26,6 @@ export const PickVersionValuesEnum = PickVersionValues.enum;
 export const FIELDS_TO_UPGRADE_TO_CURRENT_VERSION = [
   'enabled',
   'exceptions_list',
-  'alert_suppression',
   'actions',
   'throttle',
   'response_actions',
diff --git a/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/field_final_side/components/rule_field_edit_form_wrapper.tsx b/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/field_final_side/components/rule_field_edit_form_wrapper.tsx
index ab12f62cfa27b..e2148d3cf2a29 100644
--- a/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/field_final_side/components/rule_field_edit_form_wrapper.tsx
+++ b/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/field_final_side/components/rule_field_edit_form_wrapper.tsx
@@ -100,6 +100,7 @@ export function RuleFieldEditFormWrapper({
     onSubmit: handleSubmit,
     options: {
       warningValidationCodes: VALIDATION_WARNING_CODES,
+      stripEmptyFields: false,
     },
   });
 
diff --git a/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/final_edit/fields/timestamp_override.tsx b/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/final_edit/fields/timestamp_override.tsx
index a57d538fab47c..b8ef00ece3b3c 100644
--- a/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/final_edit/fields/timestamp_override.tsx
+++ b/x-pack/solutions/security/plugins/security_solution/public/detection_engine/rule_management/components/rule_details/three_way_diff/final_edit/fields/timestamp_override.tsx
@@ -72,10 +72,11 @@ function TimestampFallbackDisabled() {
   return null;
 }
 
-export function timestampOverrideDeserializer(defaultValue: FormData) {
+export function timestampOverrideDeserializer(_: unknown, finalDiffableRule: DiffableRule) {
   return {
-    timestampOverride: defaultValue.timestamp_override.field_name,
-    timestampOverrideFallbackDisabled: defaultValue.timestamp_override.fallback_disabled ?? false,
+    timestampOverride: finalDiffableRule.timestamp_override?.field_name,
+    timestampOverrideFallbackDisabled:
+      finalDiffableRule.timestamp_override?.fallback_disabled ?? false,
   };
 }