To add to this, what i assume is a related issue where displays get outlined with a white border (mentioned in depth here: AAU2 Beta: worse performance and odd white frame around MFDs in PMDG 737-800 and other aircraft) seems to have the same behavior as what you describe.
When the cursor is visible, the outlining doesn’t appear, but when the cursor disappears and you move your head with head tracking (im using track ir) it will outline the display with the now hidden cursor over it. (some dispays are not affected, like with the G1000 NXi i dont get the issue.)