The user was able to reproduce the issue with: 1.19.19 (2021.2.17f1)

First few lines of the crash:
Crashed: Loading.PreloadManager (SIGTRAP 0x00000001bb4829e8)
0 libsystem_kernel.dylib 0x69e8 __pthread_kill + 8
1 libsystem_pthread.dylib 0x10824 pthread_kill + 208
2 libsystem_c.dylib 0x1f448 raise + 28
3 UnityFramework 0xbaa960 DebugStringToFilePostprocessedStacktrace(DebugStringToFileData const&) + 222 (String.h:222)
4 UnityFramework 0xbaae10 DebugStringToFile(DebugStringToFileData const&) + 222 (String.h:222)
5 UnityFramework 0x5c0d40 MemoryManager::OutOfMemoryError(unsigned long, unsigned long, MemLabelId, char const*, int) + 1629 (MemoryManager.cpp:1629)
6 UnityFramework 0x5be5f0 MemoryManager::Allocate(unsigned long, unsigned long, MemLabelId, AllocateOptions, char const*, int) + 1636 (MemoryManager.cpp:1636)
7 UnityFramework 0x5be66c MemoryManager::Allocate(unsigned long, unsigned long, MemLabelId, AllocateOptions, char const*, int) + 1789 (MemoryManager.cpp:1789)
8 UnityFramework 0x5be66c MemoryManager::Allocate(unsigned long, unsigned long, MemLabelId, AllocateOptions, char const*, int) + 1789 (MemoryManager.cpp:1789)
9 UnityFramework 0xce1270 core::StringStorageDefault<char>::grow(unsigned long) + 532 (StringStorageDefault.h:532)