Licensee has provided a repro for this - [Link Removed]
The licensee project is attached to this Jira (RVT_OriginRebase.rar).
To reproduce load the map in the project and PIE. You will see a random rebase happen every few seconds, with the new origin represented by a sphere. There are two decals on the floor. One of them will move at each rebase if the bug is present. If the bug is fixed then the decal will stay fixed.
Note that it is expected to see a slight flicker of the decal at each rebase as the runtime virtual texture refreshes in the rebased location.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-103760 in the post.