Airplay 2 on AppleTV not sync
Today I updated all my Apple devices to test the Airplay2 feature. iPhone 7 + 4 AppleTV. Unfortunately when I'm playing music from my iPhone on 2 AppleTV the sound is totally unsynced. I can hear 1 sec on difference on each devices. It seems to work perfectly on HomePod but can we do the same on multi AppleTV ?
Thanks
Apple TV (4th generation), tvOS 11.4