Updated my project to 5.4 and encountered a lot of issues mostly with PCG. Generating PCG in editor/in game in 5.3 was almost immidiately, in 5.4 it takes several times longer makes it really problematic on large surfaces. Also there was some changes in PCG nodes, after make it work I noticed that “select points” node have weird ratio scale, like divided by 100 or so. Had to change from 0.2 to 0.002/0.004 to make it affect anything. Also combining “select points” node with a “difference” makes it lose some of points at the end, i have not had this problem in 5.3. Tested only in editor, in 5.3 packaging takes few minutes, in 5.4 after more than hour of packaging i get error at the end 
Have to stay with older version for now.