I wanted to add a decision to a transition but I found that I couldn't because only one 8th of the "Add Decision" button was showing, and clicking on that would result in... nothing. I couldn't add a decision.
This issue wasn't present in 2018.2 but since upgrading to 2019.1 it's been a huge problem considering that I need to add decisions to make the AI in my game more complex.
Note that I haven't tried adding decisions in 2018.3.
We don't support Beta releases of Unity, my recommendation is to keep with stable version always When using Beta version they are constantly making changes to the API so with we fix something, they will change it again very quickly
It's working just fine, we tested on 2019.1.0f2 before we release the update. If you got any error regarding Eventtype.mouseDown or something, just close and open the editor again
As stated in this thread with just a blank project and AI Template the UI is green and you cannot add decisions. Everything is working on older version. I would advice you to just upload multiple version of the same asset on the store to improve compatibility.