Setup: Fedora 35 Workstation, Gnome. Wayland, or Xorg.
Application Icons missing at start up
Starting point.
The machine has been on all night but all users logged out. Also happens from a boot. A user then logs in
Issue:
Click on “Activities” left top of screen (Gnome Panel)
Click on “Show Applications” Middle screen bottom right in the dock bar

Result; Only half of the application icons shown on the App Launcher Only 2 Application Launcher screens are available with the second screen only having 1 icon. (normally there are 4 App Launcher screens each with 4 rows of Application icons).

After some considerable time (not measured but 10’s of minutes) all the App Icons eventually appear in the All Launcher screens. Can not find anything that I do that triggers the appearance of the icons as some times I can do nothing fro an extend period and go back and find the missing icons just appear.

I can in the mean time select any app and launch it clicking on an App icon in the drop down “Applications” menu in the Gnome Panel.

until you get a better reply as I do not use gnome,
try installing and then changing to a different icon theme pack

since you have not mentioned which icon theme you are using, name it and name what you try if this fails please

As an aside, Fedora 35 reached end of life earlier this week.

I am using the standard icon theme as it comes in the original install I have not changed anything.

yes I am aware F35 has reached end of life. I want to get this problem fixed, if I can before o gp to F36 and then F37 as I intend to use dnf to upgrade

That makes sense.

Unfortunately, I can't help with the icon issue, as I don't know much about Gnome's inner workings.

Good luck.

right so try changing to diff icon theme as I do not use gnome either.

So you leave the launcher open, and at some point they show up?

Have you tried deleting gnome related dirs under ${HOME}/.cache (carefully, of course)? Perhaps some cache issue if they are that slow.