The Asset Optimization feature of Hummingbird seems to break when I update to Divi 3.20.1. Immediately after update, Asset Optimization returns to the Activate screen, and after the site scan finishes, the Activate screen reappears. I have seven sites running similar plugin load-outs, and the problem occurs on all of them. I have tried to rename the plugin directory and move Hummingbird only into the active plugin directory, but the problem is still present.
I have reverted back to Divi 3.19.18 and everything is working currently.