Repro steps:
- make sure you have an older GPU. with only 3 or 4GB RAM - I reproduced this on NVidia 1060 and on Radeon PRO 560 , but others with an Nvidia 3060 didn't manage to repro the crash!
- download particlePack.zip project
- open in 2020.2.5f1
- make sure Vulkan is first rendering API in the list
- build and run the Main scene
- after the build is done, press the Windows key or alt+tab to take the player out of focus
- when focusing back on, you'll notice that the scene will run at a very low fps and, if repeated a few times, it will eventually crash

Reproducible in 2020.2.5f1, 2021.1.0b7 or 2021.2.0a5
Cannot repro in older 20201, due to previous crash, that is now fixed in 5f1:https://fogbugz.unity3d.com/f/cases/1309519/

I attached my Player.log and Graphics Drivers information to this message

========== OUTPUTTING STACK TRACE ==================

0x00007FFA539354C2 (amdvlk64) vk_icdNegotiateLoaderICDInterfaceVersion
0x00007FFA53936B61 (amdvlk64) vk_icdNegotiateLoaderICDInterfaceVersion
0x00007FFA550B2328 (vulkan-1) vkDestroyDescriptorPool
ERROR: SymGetSymFromAddr64, GetLastError: 'Attempt to access invalid address.' (Address: 00007FFA5185A667)
0x00007FFA5185A667 (UnityPlayer) (function-name not available)
ERROR: SymGetSymFromAddr64, GetLastError: 'Attempt to access invalid address.' (Address: 00007FFA518395AE)
0x00007FFA518395AE (UnityPlayer) (function-name not available)
ERROR: SymGetSymFromAddr64, GetLastError: 'Attempt to access invalid address.' (Address: 00007FFA5185E2C2)
0x00007FFA5185E2C2 (UnityPlayer) (function-name not available)