Windows 10: System Icons disappearing from tray

After a recent update, currently on 20h2 build 19042.964, system icons have disappeared from the tray area near the clock. To be a little more specific, I can take all icons and hide them in the drawer and all icons show there. But when I set icons to always show, the first icon that is added disappears when more are added. It doesn't happen when all icons are set to show. Only when a select number of icons are set. It also doesn't happen with the same icon, it's always whatever icon is added first. For example, if I hide all icons, and select volume, network, and battery, the volume icon

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Tray icon disappears

I've been experiencing since the installation of Windows XP SP2 on multiple machines with the ATITool Tray Icon disappearing upon load at system startup. Sometimes it's there, sometimes it's not. Enabling or Disabling the "Hide Inactive (tray) Icons" WinXP menu option doesn't have any effect. The only way to open ATITool after it has loaded is to go through the start menu to open it again. I have "minimize on close" selected in ATITool. When closing ATITool, you see it make the motions of minimizing to the tray area but no icon is displayed. Any ideas?

 

Disappearing System Tray icon

In my case, when it disappears it is not just hidden. It is not displayed in either the system Tray or in the list of hidden icons.

This happens only on a computer that is accessed via RDP. It always happens on 1 computer that I always access with RDP. I was also able to reproduce it on another computer that I usually access "in person"; it happened the one time I accessed it with RDP but (after a reboot) has not happened since.

 

Disappearing System Tray icon

I have a situation where my Macrium Reflect "backup-in-progress" icon stops being displayed. I've reported this to Macrium, but I'd like to better understand what is going on ... including how System Tray (a.k.a. notification area) icons are displayed.

I'm running Win 10 2004 and (if it matters) Macrium Reflect Home 7.3.5289.

This problem regularly occurs on only 1 of my 4 computers, and appears to be associated with Remote Desktop access and/or disconnected mode.

On "attended" computers (i.e., not using RDP access) the backup icon is always displayed, either in the System Tray or in the list of hidden icons, when MR runs a backup. But access via RDP seems to mess this up. I can reproduce the problem on any (well, at least 2) of my computers by the following scheme:

1. Start with the computer in a "Locked" state.
2. Connect to the computer using Remote Desktop.
3. Manually start a scheduled backup. The icon appears in System Tray.
4. Disconnect the Remote Desktop connection. This puts the computer in a Locked state but the backup runs to completion.
5. Wait for the computer to enter Sleep state.
6. Wake the computer with "Wake on Lan" processing and connect with Remote Desktop again.
7. Manually start another backup. This time the icon is not displayed.
8. Disconnect Remote Desktop and log in locally.
9. Start another backup. The icon is still not displayed.
10. Reboot and start another backup. The icon is displayed.

I know nothing about the Windows notification processing so this my be a really dumb question, but is there something trying to display a Systems Tray icon while Windows is running disconnected that would make Windows flag the icon as unusable? I know that can't be universal since I have most of my System Tray icons seem bothered by this.