I have managed to pass this in the last few days. I don’t know whether I just got lucky or whether it was the tinkering I did with the test files.
However, looking at the test output messages and then trying adjusting the timeout and also the buffer size, I then passed all tests immediately.
If you have code which should be passing but isn’t, share it with me and I’ll see if I can get it to pass and then I can let you know how I did it (if I succeed).