But, is it still the same user account? with only less number of icons?
Did you notice if the other missing icons were being transferred to your other display (e.g.spacedesk display)?
For analysis, could you please send us the diagnostic logs of your primary machine.
Just connect your viewer app (to reproduce the behavior), then open the spacedesk Driver Console in your primary machine, then click Diagnostics -> “Save All Information”.
PS: Saving all information will take a few seconds, then please send us the whole folder which contains all the diagnostic logs collected.
Please right-click the folder -> Send to -> Compressed (zipped) folder, then attach the *.zip file in your next reply.