Issue reporting for gl-mt300n-v2 testing fw

The testing firmware gl-mt300n-v2-3.009-1204.bin for gl-mt300n-v2 has an issue in the luci (advanced) interface:
in the Network->switch page (http://192.168.8.1/cgi-bin/luci/admin/network/vlan ) the “add” button is not working. This is a known issue of openwrt 18.06 rc1 and has been fixed (see: FS#1657 - Cannot add/remove VLAN's in AR71xx mikrotik build · Issue #6628 · openwrt/openwrt · GitHub ).