When using PerInstanceRandom in the foliage material the foliage in the editor preview has incorrect “broken” color. In the game preview all works fine.
STR:
Create new blank project.
Create new material.
In the material editor add vector3 node and change its colour (yellow for example).
Add PerInstanceRandom node.
Add “Add” node.
Connect vector3 and PerInstanceRandom to Add node.
Connect add node to Base Color or/and Emissive Color.
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I’m also experiencing this issue in 4.19 and was able to reproduce it in a new blank project. Here is the bug report to vote on for anyone else having trouble. Unreal Engine Issues and Bug Tracker (UE-56272)