can't able to set self-cast hotkey as Mouse2

I used to do self-cast key and cancel while cast with Mouse 2.
I was doing 3 thing with mouse 2. Zoom in, self cast and cancel it while casting.
But after the big update which is when map changed it into a circle,
when I'm trying to do self cast, it keeps being cancelled and does zoom in instead of it.
I really need you guys to fix this asap. thx.
 
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