Can't connect animations in animator

(Unity 2020.3.31f1) Unity don't let me connect the idle animation to more than one animation (it's currently connected to run and if I replace run with jump the same thing happens), is it a bug? is it something about the version? Is there any solution or alternative? (The animations are 2D)

post on reddit: https://www.reddit.com/r/Unity2D/comments/tslqhd/unity_2020331f1_unity_wont_let_me_connect_the/

 

i have same problem, is a bug ，pls update to 2020.3.33.f1(LTS) ，it is solved in this version