As for fenestron related issues, there are numerous statements of stalls etc non of which have any scientific basis, in depth trials by the manufacturer and EPTS could not reproduce "fenestron issues", gross mis-handling would be the likely cause in virtually all cases.
I flew and instructed on the Gazelle at 2 FTS in the mid 80s and never heard of "Fenestron stall".
I went back to it some three years later for a CFS check ride and the term had by then been invented. First I heard about this was when I brought the tail round in a 12 kt wind to look out above and behind before departure and was instantly criticised for it; my examiner took control from me as it was apparently so dangerous
Not sure how we survived that awful episode; I'd only done it thousands of times before, in far stronger winds with no issues, as had hundreds of other pilots.