So basically I have 3 objects. One of them is solid, whereas the other two (object A & B) are not. I would like it if object 'A' passed through the solid as if it weren't there, and object B to colide with the solid as it would normally.
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i dig that topic up again since i want to know the same
You can disable Solid behavior and use Physics instead.
Physics objects will collide with eachother but objects without Physics behavior will ignore(pass through) objects with Physics.
You can also check when Object B is for example within like 3-4 pixels of the Solid and then make Object B also solid for a second or two : )