I tested with me the command "/blueprint unlock NAME rifle.ak" and it said "player not found", then I tried using the ID instead, and it worked and didn't at the same time. I mean, it unlocked the ak blueprint, but not only it... It unlocked all the game bp's even using the command to only unlock a certain item. How do I solve that?

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Ok. found out another thing: my nickname is "feRnoob". If I write "/blueprint unlock feRnoob rifle.ak" it doesn't work. If I use my ID instead, it gives me ALL the bp's BUT, if I write without being case sensitive (/blueprint unlock fernoob rifle.ak) it works... The problem is that I'm trying to setup this for an automatic store that sends the command, they do have the variable username but it returns the "right" username, with the right letter casing. Any ideas how to fix that?

When you unlock a BP using the rcon console (thanks to AliasSystem) it requires that you disconnect from the server but, when you reconnect, all the BP's will be unlocked, no only the one that you specified in the command.

Not really a bug as you're using the plugin in a way it wasn't intended.