FullBuild lvl2 champions SHOULD NOT have an item replaced when lvl 3 transformed

I had a lvl 2 {{champion:102}} with {{item:3075}} {{item:3148}} {{item:3094}} in camp. And a lvl 2 {{champion:102}} on hand with {{item:1058}} . When fusing to a lvl 3, {{item:3075}} has been dropped and i now had in hands a lvl 3 {{champion:102}} {{item:3146}} {{item:3094}} {{item:1058}} . This is totally senseless. The way items are exchanged is not clear. I essencialy lost the match due to something i litteraly couldn't crontrol
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