What is the reason for being unable to enter a C++ function from C# during mixed-mode debugging?

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The main reason for being unable to enter a C++ function from C# during mixed-mode debugging is that the debugger is unable to correctly map the C++ code to the corresponding C# code due to the differences in the compilation process and the way the languages handle memory management and other low-level details. This can lead to a mismatch between the function signatures and memory layouts, resulting in undefined behavior, crashes, and other unexpected errors. To overcome this, developers must carefully manage the interactions between the two languages and ensure that all code is properly marshaled and converted as needed.