diff --git a/packages/core/src/domain/bufferedData.spec.ts b/packages/core/src/domain/bufferedData.spec.ts
index cc11dc2f2b..e05cc65582 100644
--- a/packages/core/src/domain/bufferedData.spec.ts
+++ b/packages/core/src/domain/bufferedData.spec.ts
@@ -136,6 +136,7 @@ describe('startBufferingData', () => {
   })
 
   it('collects console logs', (done) => {
+    spyOn(console, 'error').and.callFake(noop)
     const { observable, stop } = startBufferingData()
 
     registerCleanupTask(() => {
diff --git a/packages/core/src/domain/session/sessionManager.ts b/packages/core/src/domain/session/sessionManager.ts
index f153ffcb1b..ce8573d47e 100644
--- a/packages/core/src/domain/session/sessionManager.ts
+++ b/packages/core/src/domain/session/sessionManager.ts
@@ -12,7 +12,7 @@ import {
   timeStampNow,
 } from '../../tools/utils/timeUtils'
 import { addEventListener, addEventListeners, DOM_EVENT } from '../../browser/addEventListener'
-import { startLifecycleTracker } from '../../browser/lifecycleTracker'
+import { resetLifecycleTracker, startLifecycleTracker } from '../../browser/lifecycleTracker'
 import { clearInterval, clearTimeout, setInterval, setTimeout } from '../../tools/timer'
 import { mockable } from '../../tools/mockable'
 import { noop, throttle } from '../../tools/utils/functionUtils'
@@ -373,6 +373,7 @@ export function startSessionManagerStub(): Promise<SessionManager> {
 export function stopSessionManager() {
   stopCallbacks.forEach((e) => e())
   stopCallbacks = []
+  resetLifecycleTracker()
 }
 
 function trackActivity(configuration: Configuration, expandOrRenewSession: () => void) {
diff --git a/packages/debugger/src/domain/api.spec.ts b/packages/debugger/src/domain/api.spec.ts
index 90dff6f125..a0a687c9a2 100644
--- a/packages/debugger/src/domain/api.spec.ts
+++ b/packages/debugger/src/domain/api.spec.ts
@@ -6,6 +6,7 @@ import type { Probe } from './probes'
 
 describe('api', () => {
   let mockBatchAdd: jasmine.Spy
+  let warnSpy: jasmine.Spy
 
   function initTransport(overrides: Record<string, unknown> = {}) {
     resetDebuggerTransport()
@@ -20,6 +21,7 @@ describe('api', () => {
   beforeEach(() => {
     clearProbes()
 
+    warnSpy = spyOn(display, 'warn')
     mockBatchAdd = jasmine.createSpy('batchAdd')
     initTransport()
     ;(window as any).DD_DEBUGGER = {
@@ -1135,7 +1137,6 @@ describe('api', () => {
 
     it('should handle uninitialized debugger transport gracefully', () => {
       resetDebuggerTransport()
-      const warnSpy = spyOn(display, 'warn')
 
       const probe: Probe = {
         id: 'test-probe',
diff --git a/packages/debugger/src/domain/deliveryApi.spec.ts b/packages/debugger/src/domain/deliveryApi.spec.ts
index d75401e025..6dbc325da5 100644
--- a/packages/debugger/src/domain/deliveryApi.spec.ts
+++ b/packages/debugger/src/domain/deliveryApi.spec.ts
@@ -71,6 +71,8 @@ describe('buildDeliveryApiUrl', () => {
 
 describe('deliveryApi', () => {
   let fetchSpy: jasmine.Spy
+  let errorSpy: jasmine.Spy
+  let warnSpy: jasmine.Spy
   let clock: Clock
 
   function makeConfig(overrides: Partial<DeliveryApiConfiguration> = {}): DeliveryApiConfiguration {
@@ -100,6 +102,8 @@ describe('deliveryApi', () => {
     clearProbes()
     clearDeliveryApiState()
     fetchSpy = spyOn(window, 'fetch')
+    errorSpy = spyOn(display, 'error')
+    warnSpy = spyOn(display, 'warn')
     respondWith({ nextCursor: '', updates: [], deletions: [] })
 
     registerCleanupTask(() => {
@@ -159,7 +163,6 @@ describe('deliveryApi', () => {
     })
 
     it('should warn if polling is already started', () => {
-      const warnSpy = spyOn(display, 'warn')
       startDeliveryApiPolling(makeConfig())
       startDeliveryApiPolling(makeConfig())
 
@@ -253,7 +256,6 @@ describe('deliveryApi', () => {
     })
 
     it('should log an error when the response is not ok', async () => {
-      const errorSpy = spyOn(display, 'error')
       respondWith({}, 500)
 
       startDeliveryApiPolling(makeConfig())
@@ -263,7 +265,6 @@ describe('deliveryApi', () => {
     })
 
     it('should log an error when fetch throws', async () => {
-      const errorSpy = spyOn(display, 'error')
       fetchSpy.and.returnValue(Promise.reject(new Error('network error')))
 
       startDeliveryApiPolling(makeConfig())
@@ -552,7 +553,6 @@ describe('deliveryApi', () => {
     })
 
     it('should warn when tripping', async () => {
-      const warnSpy = spyOn(display, 'warn')
       respondWithNetworkError()
       startDeliveryApiPolling(makeConfig({ pollInterval: POLL_INTERVAL_MS }))
       await flushPromises()
diff --git a/packages/rum/src/domain/record/serialization/serializeAttributes.spec.ts b/packages/rum/src/domain/record/serialization/serializeAttributes.spec.ts
index 88b3b1c7e6..3512f57947 100644
--- a/packages/rum/src/domain/record/serialization/serializeAttributes.spec.ts
+++ b/packages/rum/src/domain/record/serialization/serializeAttributes.spec.ts
@@ -116,10 +116,10 @@ describe('serializeDOMAttributes', () => {
       { html: '<div href="value">', expectedBehavior: 'always-unmasked' },
       { html: '<iframe srcdoc="value">', expectedBehavior: 'maskable' },
       { html: '<div srcdoc="value">', expectedBehavior: 'always-unmasked' },
-      { html: '<img src="value">', expectedBehavior: 'maskable-image' },
-      { html: '<img srcset="value">', expectedBehavior: 'maskable-image' },
-      { html: '<source src="value">', expectedBehavior: 'maskable-image' },
-      { html: '<source srcset="value">', expectedBehavior: 'maskable-image' },
+      { html: '<img src="data:image/gif;base64,R0lGODlhAQABAAAAACw=">', expectedBehavior: 'maskable-image' },
+      { html: '<img srcset="data:image/gif;base64,R0lGODlhAQABAAAAACw= 1x">', expectedBehavior: 'maskable-image' },
+      { html: '<source src="data:image/gif;base64,R0lGODlhAQABAAAAACw=">', expectedBehavior: 'maskable-image' },
+      { html: '<source srcset="data:image/gif;base64,R0lGODlhAQABAAAAACw= 1x">', expectedBehavior: 'maskable-image' },
       { html: '<div src="value">', expectedBehavior: 'always-unmasked' },
       { html: '<div srcset="value">', expectedBehavior: 'always-unmasked' },