If you want to take advantage of other fixes in 2026.2, you could go to Finder, Go, Go to Folder…, and paste in this path:
~/Library/Application Support/SketchUp 2026/SketchUp/PrivatePreferences.json
Edit that file in TextEdit, and look for this line:
“UseFasterShadows”: true,
Change that to false, save, and reopen SketchUp.