I got the Mac Mini with Ventura and immediately upgraded to Sonoma. At first everything worked fine. For example in Outlook for Mac I could select text and make it bold or select text and change the color. The selected text would have a grayish shading to show that it had been selected. With the new Os the apps obviously also updated, I didn't keep track of those. I could click anywhere in a string of text and I could see the cursor where I clicked.
At some point I realized that selected text doesn't have the grayish shading anymore. If I select text to make it bold, I can still do that, but the selected text doesn't have a shading anymore, so only after I made it bold, I can see that the last letter for example wasn't part of the selection. Impossible to see at first since there isn't a shading over the selected characters/text. When I click anywhere in a paragraph, I cannot see the cursor, so I have to type a character to see where the cursor actually is.
I created a virtual machine today with UTM and installed Ventura. Text selection was fine, text that I selected had a grayish shading. So, it appears to be Sonoma that is causing this. In some apps selected text still has a grayish tint, but in the app I use most (Outlook), it doesn't work.