[Hummingbird] Conflict with Oxygen builder

We’ve installed an mu-plugin from this thread: https://wpmudev.com/forums/topic/hummingbird-affecting-style-on-site-layout/ to fix an issue with Hummingbird and Oxygen builder conflict when activating Asset Optimisation. The patch worked to avoid the styles being broken, but still options like Combine don’t work. Also, even though the option is enabled, assets aren’t served from the CDN.