Builtin CPU test failed

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JYK
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Builtin CPU test failed

JYK
I am doing the project 5 via the online IDE, when I first try to run the builtin CPU as usual, it failed with the test script CPU.tst, does anybody face the same issue? And when I switched to CPU-external.tst it passes the test no matter what you write in hdl, very weird situation. I checked closely the CPU-external.tst it turns out this test script doesnt include any compare file that's why it passes hdl all the time. What should I do? Becuase if  the CPU.tst failed with the buitin CPU and the CPU-external.tst passes the design all the time, how can I know if my hdl is gonna be correct??