Why does the RtlDispatchException function return true?

[Kamiya-Naoki]

I am trying to parse a PE32 binary that does not implement the program's own exception handler.
This binary intentionally raises an ACCESS_VIOLATION exception; when attached and run on x86dbg, RtlDispatchException returns false, whereas when run on Cuckoo Sandbox, I found that RtlDispatchException returns true.

The OS running on the VM is Windows 7 Professional 32bit (RTM).

If you know the cause, please let me know.