All these VMs have network adapter set to use as Bridged mode, pretending connecting directly to the physical network. But when I went into Virtual Network Editor from Edit menu, I didn’t see a Bridged type of connection available in the list. And it kept telling me it’s unavailable when I tried to manually add it.

What I did that actually fixed this issue is to simply press that Restore Default button at the bottom left corner in Virtual Network Editor. It took about a minute to reset all network settings. And when it’s finished, the VMnet0 set as Bridged type miraculously returned.