Blackboard value resetting/not saving

Hello, my problem is that I set blackboard value in BTS where I look for a player and it is set correctly (so within BTS blackboard values are correct), but when it moves to a BTT, the value is reset to default (within BTT, which happens after BTS, all variables are empty), any ideas why it happens?

So it first prints Valid and then Invalid.

I figured it out, I had simply not selected correct values in the AI tree.