quickstart-unity: [Bug]

[REQUIRED] Please fill in the following fields:

• Unity editor version: 2020.3.7f1
• Firebase Unity SDK version: 8.4.0
• Source you installed the SDK: .unityoackage
• Problematic Firebase Component: check attached files
• Other Firebase Components in use: Firebase Analytics, Remote Config, firebase-messaging, firebase-crashlytics
• Additional SDKs you are using: fyber,facebook
• Platform you are using the Unity editor on: windows
• Platform you are targeting: iOS/Android
• Scripting Runtime: Mono, IL2CPP

[REQUIRED] Please describe the issue here:

Hello, in crashlytics window we started to see the crashes pthread_mutex_lock that may be related to firebase and are causing issues to number of users. Please double check the attached files below. Thank you

Steps to reproduce:

Have you been able to reproduce this issue with just the Firebase Unity quickstarts (this GitHub project)? Unfortunately we don’t have any more information than ones that you can see in files attached below

What happened? How can we make the problem occur? Unfortunately we don’t have any more information than ones that you can see in files attached below

If you have a downloadable sample project that reproduces the bug you’re reporting, you will Unfortunately we don’t have any more information than ones that you can see in files attached below

Relevant Code:

// TODO(you): code here to reproduce the problem

pthread_mutex_lock line 4.txt pthread_mutex_lock line 2.txt pthread_mutex_lock line 8.txt pthread_mutex_lock.txt