4.5 causing trouble with behavior tree?

Hey Guys I’m using a simple behavior tree for my AI which looks something like this.

My AI used to attack the player whenever it gets closer and stops attacking as the player moves away. It was working perfectly and still does when i open it up with 4.4.3.

But as I opened the same project with 4.5(released version) The attacking variable in the service never lets the variable to set as true inside the Attack Player node. And the AI starts moving like a glitch(vibrating) when closer to the player.

How can I solve this?

Please help. Thank You