The attached image after
run("Auto Local Threshold", "method=Otsu radius=15 parameter_1=0 parameter_2=0 white");
run("Linear Kuwahara", "number_of_angles=30 line_length=11 criterion=Variance");
setOption("BlackBackground", false);
run("Convert to Mask");
run("Fill Holes");
loses a particle in the center.
Is this a bug?