Q-in-Q using issue (OpenWrt 22.03.2)

Hello there. I recently decided to check whether vlan and q-in-q features work. My device is Zbtlink ZBT-1602 (with 16M flash), and OpenWRT version 22.03.2. So vlan (802.1q) works fine. But I really don't know how to work with Q-in-Q (802.1ad). As far as I know first - creating q-in-q (802.1ad device), and then adding to user defined bridge. But when I add this device to bridge my router stops to respond. And reset doesn't help, only firmware reupload helps. What am I doing wrong? Does even Q-in-Q work in my device?