We have SN: HCB085HSRKR of a CCR2216-1G-12XS-2XQ using 7.7 software. It appears as thought there is an issue in traffic-flow on a VLAN interface data is only reported one-way ( data received from client IP not sent to the client from MikroTik ). The reporting works correctly on an ethernet only interface. Have created a ticket but no fix in in almost 4 months.
model = CCR2216-1G-12XS-2XQ
/ip traffic-flow
set cache-entries=8M enabled=yes
/ip traffic-flow target
add dst-address=172.31.0.114 src-address=172.31.0.9