Crash with multiple stack traces when generating a Font Atlas

How to reproduce:

1. Create a project
2. Install the uGUI package
3. Import TMP Essential Resources (Window > TextMeshPro > Import TMP Essential Resources)
4. Open TMP Font Asset Creator (Window > TextMeshPro > Font Asset Creator)
5. Generate a Font Atlas
6. Observe the crash

Reproducible with: 6000.0.0f1 (4ff56b3ea44c), 6000.0.61f1, 6000.0.73f1, 6000.3.14f1, 6000.4.4f1, 6000.5.0b5, 6000.6.0a3

Reproduced on: Windows 11
Not reproduced on: No other environments tested

Notes:

• Crash is inconsistent and sometimes depends on the font being used for Atlas generation
• Editor also crashes after generating Font Atlas just after reimporting everything
• There had been incidents where Editor crashed untouched a few minutes after reloading the project
• There had been incidents where Editor crashed when closing the project with Font Atlas still being generated

First few lines of the stack traces:
0x00007FFBC9EDF039 (Unity) tlsf_free
0x00007FFBC79E15A0 (Unity) DynamicHeapAllocator::Deallocate
0x00007FFBC79E8CF6 (Unity) DynamicHeapAllocator::TryDeallocate
0x00007FFBC79F2DC0 (Unity) DualThreadAllocator<DynamicHeapAllocator>::TryDeallocate
0x00007FFBC79E9315 (Unity) MemoryManager::TryDeallocateWithLabel
0x00007FFBC79EAB43 (Unity) free_alloc_internal

0x00007FFBC54BBA85 (Unity) block_locate_free
0x00007FFBC54BC202 (Unity) tlsf_memalign
0x00007FFBC54E5080 (Unity) DynamicHeapAllocator::Allocate
0x00007FFBC54E46AD (Unity) DualThreadAllocator<DynamicHeapAllocator>::Allocate
0x00007FFBC54E56AD (Unity) MemoryManager::Allocate