At least for me the problem is independent whether you upgrade from 2.8.22 or you do a fresh install. Out of 4 different machines it worked fine on 2 and on the other 2 it did not. Two of those machines with different results were exactly the same hardware but on is single monitor, the other is multi monitor.
It is independent whether you use roaming profile or local profile.
Although changing to "legacy theme" and using icon "size from the theme" restored most of the icons, there are still a number of them "missing".
I honestly think the icon sizing is broken and in certain conditions the icons become very small. Custom icon size is not working correctly for me. I get them the biggest when I set it to medium. The problem is - the icon size settings do not apply everywhere - some change size while other do not.
My way to check whether the icons are there was to switch between Symbolic and and Color theme - I could see the dots changing colors.
It is independent whether you use roaming profile or local profile.
Although changing to "legacy theme" and using icon "size from the theme" restored most of the icons, there are still a number of them "missing".
I honestly think the icon sizing is broken and in certain conditions the icons become very small. Custom icon size is not working correctly for me. I get them the biggest when I set it to medium. The problem is - the icon size settings do not apply everywhere - some change size while other do not.
My way to check whether the icons are there was to switch between Symbolic and and Color theme - I could see the dots changing colors.