So I'm also having this issue. I have a MBP 16", 2.6GHz 6 Core i7 with 32GB of memory. Big Sur 11.0.1. I Just upgraded to 4.8 and I can't select the objects. If I clear out my mac cache it works for about 2 min and then when i try to manipulate, it goes away. I have no third party packages installed at all. Any ideas from anyone?