Animation meshes disappear

When upgrading to Unity 2019.3.7f1 my animations meshes suddenly disappear...


In this transition, it is supposed to be my character mesh running and making the transition from one animation to another, but it is not shown...

Also when adding other animations and setting up the humanoid character creating the avatar from that file, it also does not appear...



I do not know if it is due to Universal Render Pipeline...?

I can not work with this problem because I am not able to set events on animations and set up the transitions properly...

I wish you could help me in finding the solution, or guiding me in how to set up the blender file or the unity's animation tab.

For animation and modelling, I use Blender 2.82

Thanks

 

Has anyone came across with the same problem?