2019.1 unable to change material transparency

I have a script that fades in objects, it worked on 2018.3 and it still does but its not working on 2019.1 since i upgraded the project. Using LWRP on both 2018.3 and 2019.1

The version 2019 is bad.

https://forum.unity.com/threads/share-your-unity-2019-1-0f2-experience.670816/

Wow i see there are a lot of problems. I migrated to 2019 in order to convert some of my behaviours to ECS and Jobs because installing Entities and Burst on 2018.3 gave me error on Unity.module.mathematics dependency, you know something about this error?
@roka