after a boolean operation I was trying to bevel some edges, the result is completely random, any idea how deal with this? My ideal result would be something like this
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One of your face is reversed, you need to recalculate the normals (in Edit mode, select all and ctrlN).
I guess it messed up with the bevel because bevel uses the orientation to create the bevel profile, so two faces with opposite normal orientation > bug.
Anyway, here is a way to do it: