Thanks for the post here! This resolved an issue I was having when spawning an object and attaching it to the player character via Blueprints. Once attached, and after the player had been mobile for a period of time, the object would eventually seem to disappear from its location on the player.
Viewing the location values for the object in the editor would show it ticking wildly in other directions like it was gradually drifting away.
After setting Use Attach Parent to True the object no longer seems to disappear or stray from its set location after being attached.