Network `Disconnect` option grayed out after using `sudo netplan apply` (Xubuntu 20.04)

Question

I was following this tutorial to setup static ip address on my xfce 20.04 laptop. Everything was fine until I executed sudo netplan apply, after which the disconnect button on the network config panel was grayed out and I was no longer able to disconnect from neither my wifi nor ethernet. I tried few things like sudo systemctl restart network-manager.service, sudo rfkill unblock wifi, and sudo ifconfig wlp2s0 up (yes I checked the interface name), but none worked.
After a reboot, the problem went away, but then it came back after I executed sudo netplan apply.
My /etc/netplan/01-network-manager-all.yml looks like this:

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp3s0:
      dhcp4: no
      addresses:
        - 192.168.1.17/24
      gateway4: 192.168.1.1
      nameservers:
          addresses: [8.8.8.8, 1.1.1.1]

For those wondering what I'm doing, I am setting up my home network with openwrt routers and it requires me to set a static ip address to be able to access them in their fail-safe mode. For that reason I am going to be changing my computer's config many times, so re-booting every time I change anything is something that I want to avoid.