diff --git a/apps/browser/src/autofill/services/collect-autofill-content.service.spec.ts b/apps/browser/src/autofill/services/collect-autofill-content.service.spec.ts
index 63f7c105d74..485c85dd014 100644
--- a/apps/browser/src/autofill/services/collect-autofill-content.service.spec.ts
+++ b/apps/browser/src/autofill/services/collect-autofill-content.service.spec.ts
@@ -2297,6 +2297,9 @@ describe("CollectAutofillContentService", () => {
 
     it("schedules a debounced check for new shadow roots", () => {
       jest.useFakeTimers();
+      const div = document.createElement("div");
+      document.body.appendChild(div);
+
       const mutationRecord: MutationRecord = {
         type: "childList",
         addedNodes: document.querySelectorAll("div"),
@@ -2305,7 +2308,7 @@ describe("CollectAutofillContentService", () => {
         nextSibling: null,
         oldValue: null,
         previousSibling: null,
-        removedNodes: null,
+        removedNodes: document.querySelectorAll("nonexistent"),
         target: document.body,
       };
       collectAutofillContentService["currentLocationHref"] = window.location.href;
@@ -2330,6 +2333,9 @@ describe("CollectAutofillContentService", () => {
 
     it("does not schedule duplicate shadow root checks when already pending", () => {
       jest.useFakeTimers();
+      const div = document.createElement("div");
+      document.body.appendChild(div);
+
       const mutationRecord: MutationRecord = {
         type: "childList",
         addedNodes: document.querySelectorAll("div"),
@@ -2338,7 +2344,7 @@ describe("CollectAutofillContentService", () => {
         nextSibling: null,
         oldValue: null,
         previousSibling: null,
-        removedNodes: null,
+        removedNodes: document.querySelectorAll("nonexistent"),
         target: document.body,
       };
       collectAutofillContentService["currentLocationHref"] = window.location.href;
diff --git a/apps/browser/src/autofill/services/dom-query.service.spec.ts b/apps/browser/src/autofill/services/dom-query.service.spec.ts
index 6ff520dad2d..26cc731ffb3 100644
--- a/apps/browser/src/autofill/services/dom-query.service.spec.ts
+++ b/apps/browser/src/autofill/services/dom-query.service.spec.ts
@@ -233,6 +233,13 @@ describe("DomQueryService", () => {
   });
 
   describe("checkForNewShadowRoots", () => {
+    beforeEach(() => {
+      // Clear any shadow roots from previous tests
+      document.body.innerHTML = "";
+      // Reset the observed shadow roots set
+      domQueryService["observedShadowRoots"] = new WeakSet<ShadowRoot>();
+    });
+
     it("returns true when a shadow root is not in the observed set", () => {
       const customElement = document.createElement("custom-element");
       customElement.attachShadow({ mode: "open" });