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B4 its been working fine, sort of. But this time it won't bevel this particular part. It basically adds something like a loop cut to the face.
I've had this issue before, I'm not sure if this will work for you but ctrl+a -> apply scale works for me
ctrl+a -> apply scale
Probably your problem is that the top part of the mesh is an ngon that bends around the corner connected to the edge you are trying to bevel.
I tried with a similar geometry:
After dividing the top surface into two quadrilaterals, beveling works fine:
I hope this helps.