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Random iOS crashes with ARFoundation and Vuforia

I have a problem with integration Unity 2021.1.13f1 and Vuforia 9.8.8 with ARFoundation 4.1.7 on iOS 14.6 (iPad) it happens even on new Unity project only with ARFoundation ARKit and Vuforia installed. I followed this tutorial: https://library.vuforia.com/articles/Solution/ar-foundation.html and my application is randomly crashing, sometimes just after start, sometimes after minute or two. The Xcode always throw error at different places with code: EXC_BAD_ACCESS. It doesn't happen when I use ARFoundation standalone or Vuforia standalone. I spend many days trying different versions and configurations but random crashes are still existing. Is there anything I can do to prevent those crashes? 

stacktrace: https://pastebin.com/bkTjiCJX

other crash stacktrace: https://pastebin.com/r9HcJp4A

Example error in attachment:

 

 

Image removed.

Hi,

this issue was reported to Vuforia Engine Developer team - short description: "Instability or prematurely app crashes on IOS when using Unity 2021.1.13f1 Vuforia 9.8.8 with ARFoundation 4.1.7 on IOS 14.6."