Combining Humanoid and Generic animation in a single animator file Fails.

HI everybody,
I don't know if someone did ever encounter that case but here is the fact.
I tried to use a lot of humanoid animation on a model we made, which works pretty fine.
But for one animation that uses the same structure than the others it dropped weird results ,e.g. feet going underfloor.
So to keep animation the good looking I switched it to generic and decided to use it this way. But here is the fact, if I have at least one generic (not considered Humanoid) animationin my animator every other Humanoid animations won't work anymore.
Any tips on how to avoid that behavior without making coding too tricky?
Or is it just a solution to forget?

Thanks.

 

Same same same problem with me.
Are you been able to figure that out?
How you managed to do this?