Kavaero is not a DFC, it doesn't have a backside, so it cannot be transformed or enter transformed. The copy effect ends with Kavaero leaving the battlefield, and it never copied the backside anyway. Only TOKEN copies get to also copy the backside, which is still a rather recent rules change. But token copies don't work with Jecht either, since a token that leaves the battlefield cannot return.

So, not a bug, just the game following the rules.

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The interaction should work in this gameplay since it works with Doomsday Excruciator. Same thing, if it copies the name and still executes the abilities then it should execute the abilities for all the creatures.