Looks like a misplacement bug has shown up between 4.11 until 4.12 final release. I'm using XFCE 4.12 from Fedora COPR and saw a misbehaviour when pressing "Arrange Desktop Icons". The icons magically disappear, get aligned elsewhere, show up again, go away and so on. The only way to get them back is going into "Desktop Settings -> Icons -> Change Icon Type to something else and then back". Attached 3 Screenshots. This didn't happen with 4.11, so this must be a quite close recent change inside GIT.
Created attachment 6028
Correct Arrange of Icons
Looks like a misplacement bug has shown up between 4.11 until 4.12 final release. I'm using XFCE 4.12 from Fedora COPR and saw a misbehaviour when pressing "Arrange Desktop Icons". The icons magically disappear, get aligned elsewhere, show up again, go away and so on. The only way to get them back is going into "Desktop Settings -> Icons -> Change Icon Type to something else and then back". Attached 3 Screenshots. This didn't happen with 4.11, so this must be a quite close recent change inside GIT.