Seen something similar in 8.43 but havent got around to working it out.
Does the same thing happen to local accounts? or just AD accounts?
D-002808 and D-002809 are along these lines. Didn't see them in the 8.6 release notes.
Same thing happens to us. Only thing we saw it happen to was applying a desktop background.
Looks like the issue maybe that the scripts called "loginhook.sh" & "startupscript.sh" found in: /Library/Application Support/JAMF/ManagementFrameworkScripts perform a /usr/sbin/jamf mcx.. The first @ a user level, 2nd computer…
So this is where things are being refreshed.