Didn't get free win in promos

So, yesterday I was playing my promo games for platinum 5 and I failed. Later that day i played some dynamic queue (although I'm not huge fan of dynamic queue) with my friends and got in promos again and as I said in the title I didn't get free win. First I thought that if i just wait some time it's gonna appear but nope, still not there. So I'm asking you is this some bug or you simply don't get free win for going to higher tier?
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