Nope, this issue may only appear with vlan filtering enabled but is confirmed to be an issue in 7.8, 7.9, 7.10, 7.11, 7.12, 7.13, 7.14 and now 7.15rc.You can always go back to v7.14.X DHCP snooping is working as expected on this version
Worked fine on RouterOS 6...