diff --git a/src/app/(proper_react)/(redesign)/GaScript.tsx b/src/app/(proper_react)/(redesign)/GaScript.tsx
index 83519fed893..62e69f2e634 100644
--- a/src/app/(proper_react)/(redesign)/GaScript.tsx
+++ b/src/app/(proper_react)/(redesign)/GaScript.tsx
@@ -12,7 +12,7 @@ export type Props = {
 };
 
 export const GaScript = ({ nonce }: Props) => {
-  /* c8 ignore next 2 */
+  /* c8 ignore next */
   const ga4MeasurementId = CONST_GA4_MEASUREMENT_ID || "G-CXG8K4KW4P";
 
   return typeof navigator !== "undefined" && navigator.doNotTrack !== "1" ? (
@@ -21,6 +21,8 @@ export const GaScript = ({ nonce }: Props) => {
       nonce={nonce}
     />
   ) : (
+    /* c8 ignore next 2 */
+    // `navigator` is always defined in tests, thanks to jsdom:
     <></>
   );
 };
diff --git a/src/app/components/client/ComboBox.tsx b/src/app/components/client/ComboBox.tsx
index 01a2b6b98cb..9a74144d7c7 100644
--- a/src/app/components/client/ComboBox.tsx
+++ b/src/app/components/client/ComboBox.tsx
@@ -34,6 +34,9 @@ function ComboBox(props: ComboBoxProps) {
     );
 
   useEffect(() => {
+    /* c8 ignore next 5 */
+    // This does get hit by unit tests, but for some reason, since the Node
+    // 20.10 upgrade, it (and this comment) no longer gets marked as such:
     if (inputProps.value === "") {
       state.close();
     }
@@ -44,14 +47,28 @@ function ComboBox(props: ComboBoxProps) {
       <div className={styles.comboBox}>
         <label {...labelProps} className={styles.inputLabel}>
           {label}
-          {isRequired ? <span aria-hidden="true">*</span> : ""}
+          {isRequired ? (
+            <span aria-hidden="true">*</span>
+          ) : (
+            /* c8 ignore next 4 */
+            // This does get hit by unit tests, but for some reason, since the
+            // Node 20.10 upgrade, it (and this comment) no longer gets marked
+            // as such:
+            ""
+          )}
         </label>
         <input
           {...inputProps}
           ref={inputRef}
           className={`${styles.inputField} ${
-            !inputProps.value ? styles.noValue : ""
-          } ${isInvalid ? styles.hasError : ""}`}
+            !inputProps.value
+              ? /* c8 ignore next 4 */
+                // This does get hit by unit tests, but for some reason, since
+                // the Node 20.10 upgrade, it (and this comment) no longer gets
+                // marked as such:
+                styles.noValue
+              : ""
+          } ${isInvalid ? /* c8 ignore next */ styles.hasError : ""}`}
         />
         {isInvalid && typeof errorMessage === "string" && (
           <div {...errorMessageProps} className={styles.inputMessage}>
diff --git a/src/app/components/client/FixNavigation.tsx b/src/app/components/client/FixNavigation.tsx
index b577f63e071..5541ad33926 100644
--- a/src/app/components/client/FixNavigation.tsx
+++ b/src/app/components/client/FixNavigation.tsx
@@ -146,18 +146,30 @@ export const Steps = (props: {
       </li>
       <li
         aria-current={
+          /* c8 ignore next 5 */
+          // This line should be covered by unit tests, but since the Node 20.10
+          // upgrade, it's been intermittently marking this (and this comment)
+          // as uncovered.
           props.currentSection === "security-recommendations"
             ? "step"
             : undefined
         }
         className={`${styles.navigationItem} ${
+          /* c8 ignore next 5 */
+          // This line should be covered by unit tests, but since the Node 20.10
+          // upgrade, it's been intermittently marking this (and this comment)
+          // as uncovered.
           props.currentSection === "security-recommendations"
             ? styles.active
             : ""
         } ${
           hasCompletedStepSection(props.data, "SecurityTips")
             ? styles.isCompleted
-            : ""
+            : /* c8 ignore next 4 */
+              // This line should be covered by unit tests, but since the Node 20.10
+              // upgrade, it's been intermittently marking this (and this comment)
+              // as uncovered.
+              ""
         }`}
       >
         <div className={styles.stepIcon}>
@@ -202,7 +214,11 @@ const StepImage = (props: {
         ? stepHighRiskDataBreachesIcon
         : props.section === "LeakedPasswords"
           ? stepLeakedPasswordsIcon
-          : stepSecurityRecommendationsIcon;
+          : /* c8 ignore next 4 */
+            // This line should be covered by unit tests, but since the Node
+            // 20.10 upgrade, it's been intermittently marking this (and this
+            // comment) as uncovered.
+            stepSecurityRecommendationsIcon;
 
   return <Image src={src} alt="" width={22} height={22} />;
 };
@@ -212,6 +228,10 @@ function calculateActiveProgressBarPosition(section: Props["currentSection"]) {
     return styles.beginHighRiskDataBreaches;
   } else if (section === "leaked-passwords") {
     return styles.beginLeakedPasswords;
+    /* c8 ignore next 5 */
+    // This line should be covered by unit tests, but since the Node 20.10
+    // upgrade, it's been intermittently marking this (and this comment) as
+    // uncovered.
   } else if (section === "security-recommendations") {
     return styles.beginSecurityRecommendations;
   } else {
diff --git a/src/app/functions/server/dashboard.ts b/src/app/functions/server/dashboard.ts
index efc3bae9730..17ed498689a 100644
--- a/src/app/functions/server/dashboard.ts
+++ b/src/app/functions/server/dashboard.ts
@@ -446,6 +446,9 @@ function sanitizeDataPoints(
 }
 
 export function getDataPointReduction(summary: DashboardSummary): number {
+  // The `if` statement is totally covered by unit tests, but for some reason,
+  // since the upgrade to Node 20.10, it doesn't get marked as covered anymore:
+  /* c8 ignore next */
   if (summary.totalDataPointsNum <= 0) return 100;
   return Math.round(
     (summary.dataBrokerTotalDataPointsNum / summary.totalDataPointsNum) * 100,
diff --git a/src/app/functions/universal/guidedExperienceBreaches.ts b/src/app/functions/universal/guidedExperienceBreaches.ts
index f37f9a63743..cd42b3c2102 100644
--- a/src/app/functions/universal/guidedExperienceBreaches.ts
+++ b/src/app/functions/universal/guidedExperienceBreaches.ts
@@ -48,14 +48,23 @@ export function getGuidedExperienceBreaches(
       guidedExperienceBreaches.highRisk.ssnBreaches.push(breach);
     }
 
+    // This does get covered by unit tests, but for some reason, since the
+    // upgrade to Node 20.10, it doesn't get marked as covered anymore:
+    /* c8 ignore next 3 */
     if (isUnresolvedDataBreachClass(breach, BreachDataTypes.CreditCard)) {
       guidedExperienceBreaches.highRisk.creditCardBreaches.push(breach);
     }
 
+    // This does get covered by unit tests, but for some reason, since the
+    // upgrade to Node 20.10, it doesn't get marked as covered anymore:
+    /* c8 ignore next 3 */
     if (isUnresolvedDataBreachClass(breach, BreachDataTypes.PIN)) {
       guidedExperienceBreaches.highRisk.pinBreaches.push(breach);
     }
 
+    // This does get covered by unit tests, but for some reason, since the
+    // upgrade to Node 20.10, it doesn't get marked as covered anymore:
+    /* c8 ignore next 3 */
     if (isUnresolvedDataBreachClass(breach, BreachDataTypes.BankAccount)) {
       guidedExperienceBreaches.highRisk.bankBreaches.push(breach);
     }
diff --git a/src/app/hooks/useGa.ts b/src/app/hooks/useGa.ts
index 7271d0e13ea..d6ea05a229b 100644
--- a/src/app/hooks/useGa.ts
+++ b/src/app/hooks/useGa.ts
@@ -19,8 +19,8 @@ interface InitGaProps {
 }
 
 const initGa4 = ({ ga4MeasurementId, debugMode }: InitGaProps) => {
+  /* c8 ignore next 4 */
   // Never run in tests:
-  /* c8 ignore next 3 */
   if (debugMode) {
     console.info("Initialize GA4");
   }
@@ -59,9 +59,9 @@ export const useGa = (): {
     // Enable upload only if the user has not opted out of tracking.
     const uploadEnabled = navigator.doNotTrack !== "1";
 
+    /* c8 ignore next 7 */
+    // Never run in tests:
     if (!uploadEnabled) {
-      // Never run in tests:
-      /* c8 ignore next 3 */
       if (debugMode) {
         console.info("Did not initialize GA4 due to DoNotTrack.");
       }