In systemd-networkd documentation found that networkd assign different MAC 
address to the bridge than physical interface has and this my lead to some 
connection issues. To avoid this problems you must specify MAC address to 
bridge interface same as on your physical device. 
After I add proper MAC address to bridge interface configuration start working. 

New working config:

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s3:
      dhcp4: no
      dhcp6: no
  bridges:
    br-ex:
      macaddress: 08:00:27:0b:07:94
      interfaces: [enp0s3]
      addresses: [10.64.10.100/24]
      gateway4: 10.64.10.1
      mtu: 1500
      nameservers:
        addresses: [8.8.8.8]
      dhcp4: no
      dhcp6: no
      parameters:
        stp: no


I suggest this MAC address issue should be mentioned in Netplan documentation. 
Particular in examples page (https://netplan.io/examples) because it appear as 
first result when googling how to configure network with netplan.

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https://bugs.launchpad.net/bugs/1860781

Title:
  netplan networkd - bridge configuration not work

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