This is an Ura-Masyu puzzle. That means that it’s solvable both normally as a Masyu puzzle, and also as a puzzle if the black and white pearls are switched.

Note in particular that unlike my last Masyu, this puzzle is not antisymmetric, so solving the Masyu half is different than solving the Ura-Masyu half. It’s an amusing coincidence that puzzle 22 is also a Masyu (though not solvable as Ura-Masyu).