Class handle. Matlab

I have 2 similar classes:

classdef class1 < handle

    properties (Access = public)
        b
    end

    properties (Access = private)
        a
    end

    methods (Access = public)
        function this = class1()
            this.a = 1;
            this.b = 1;
        end

        function test(this)
            'Inside class'
            this.a
            this.b
            this.a = 2;
            this.b = 2;
        end
    end

end

And the second:

classdef class2

    properties (Access = public)
        b
    end

    properties (Access = private)
        a
    end

    methods (Access = public)
        function this = class2()
            this.a = 1;
            this.b = 1;
        end

        function test(this)
            'Inside class'
            this.a
            this.b
            this.a = 2;
            this.b = 2;
        end
    end

end

One time I inherit from handle. Other one I don't do it. After I create such script:

solver1 = class1();
solver1.b
solver1
solver1.test()
solver1.b
solver1
solver1.test()



solver2 = class2();
solver2.b
solver2
solver2.test()
solver2.b
solver2
solver2.test()

If I debug my program step by step, I see that a and b haven't changed in the second class after solver2.test(). But the first class these variable have changed after solver1.test(). What resasons this issue?

I solve this problem with next way. I declare global variable into class. And after this, I can check this any variable in and out class. This is bad way, but it's work.