Generic List Variable type lost in Visual Scripting 2021

Hi. I lost reference to System → Collections in the variable selector. So I cant use Lists. In the same project i previously used them. Also if I open a new proyect I can perfectly use Lists (shows it in the images).
How can I solve it?
I tried:

  • Closing and open again de project
  • In Edit → Project Settings → Visual Scripting → “Regenerate Units”
  • Custom Inspector Properties → “Generate”
  • Script Reference Solver → “Fix Missing Scripts”

Unity Version 2021.1.13f1

185389-without.png

In a new proyect
185390-with.png

I was on iOS build. Seems like in this build the System → Collections → Generic Variables Types are disable or bug. When I change to PC, Mac & Linux the problem was resolved.