Reproduction steps:
-Due to the nature of this crash, there is no way currently to reproduce it

Reproducible with, according to user reports 2018.4.32f1, 2019.4.17f1, 2019.4.21f1, 2019.4.23f1

Notes:
-Crashes seem to appear after upgrading from 2018.4 to 2019.4

iOS Stacktrace:
0 UnityFramework 0x101bca07c PersistentManager::ReadAndActivateObjectThreaded(int, SerializedObjectIdentifier const&, SerializedFile*, bool, bool, PersistentManager::LockFlags) + 2693812
1 UnityFramework 0x101bca29c PersistentManager::LoadObjectsThreaded(int const*, int, LoadProgress&, bool, PersistentManager::LockFlags) + 2694356
2 UnityFramework 0x101acdcd4 LoadOperation::Perform() + 1660684
3 UnityFramework 0x1017e3edc AssetBundleLoadAssetOperation::Perform() + 1710792
4 UnityFramework 0x101ad03c0 PreloadManager::ProcessSingleOperation() + 1670648
5 UnityFramework 0x101ad0164 operator delete[](void*, std::nothrow_t const&) + 1670044
6 UnityFramework 0x101ad00d0 PreloadManager::Run(void*) + 1669896
7 UnityFramework 0x101b38a08 Thread::RunThreadWrapper(void*) + 2098240
8 libsystem_pthread.dylib 0x1f1c4fc9c _pthread_start + 288
9 libsystem_pthread.dylib 0x1f1c54880 thread_start + 8

Android Stacktrace:
libunity.0x39a304 (PersistentManager::ReadAndActivateObjectThreaded(int, SerializedObjectIdentifier const&, SerializedFile*, bool, bool, PersistentManager::LockFlags) at ??:?)
libunity.0x39a4d0 (PersistentManager::LoadObjectsThreaded(int const*, int, LoadProgress&, bool, PersistentManager::LockFlags) at ??:?)
libunity.0x2d7958 (LoadOperation::Perform() at ??:?)
libunity.0x15df0c (AssetBundleLoadAssetOperation::Perform() at ??:?)
libunity.0x2d9c0c (PreloadManager::ProcessSingleOperation() at ??:?)
libunity.0x2d9a58 (PreloadManager::Run() at ??:?)
libunity.0x2d99c4 (PreloadManager::Run(void*) at ??:?)
libunity.0x336c08 (Thread::RunThreadWrapper(void*) at ??:?)
libunity.0x15059a (Object::SetIsPersistent(bool) at ??:?)
libunity.0x2682d1 (SerializedFile::ReadObject(long long, ObjectCreationMode, bool, TypeTree const**, bool*, Object&) at ??:?)
libunity.0x261e3b (PersistentManager::ReadAndActivateObjectThreaded(int, SerializedObjectIdentifier const&, SerializedFile*, bool, bool, PersistentManager::LockFlags) at ??:?)
libunity.0x261f47 (PersistentManager::LoadObjectsThreaded(int const*, int, LoadProgress&, bool, PersistentManager::LockFlags) at ??:?)
libunity.0x1d5711 (LoadOperation::Perform() at ??:?)
libunity.0xca02b (AssetBundleLoadAssetOperation::Perform() at ??:?)
libunity.0x1d6fe9 (PreloadManager::ProcessSingleOperation() at ??:?)
libunity.0x1d6ec5 (PreloadManager::Run() at ??:?)
libunity.0x1d6e5b (PreloadManager::Run(void*) at ??:?)
libunity.0x21b89b (Thread::RunThreadWrapper(void*) at ??:?)