Dualband WPA2-Enterprise with dynamic VLAN causes problems

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi there,

I have an new AP with dualband radios, a BTHub Home 5A with latest LEDE Reboot 17.01.4 r3560-79f57e422d
I want to implement my Wifi network with WPA2-Enterprise and dynamic VLAN assignment but it is not working.

If I connect to 2,4GHz it is working fine, but 5GHz is not working anymore. On the other way when connected to 5GHz first, 2,4GHz is not working anymore.

Without Dynamic VLAN it is working just fine... I'm using hostapd (not wpad)

Config:

config wifi-iface
        option ifname 'wlan1-0'
        option device 'radio1'
        option mode 'ap'
        option ssid 'EAP-Test-5GHz'
        option encryption 'wpa2+ccmp'
        option auth_port '1812'
        option auth_secret '...'
        option dynamic_vlan '2'
        option vlan_tagged_interface 'eth0'
        option vlan_bridge 'br-vlan'
        option vlan_naming '0'
        option auth_server '...'
config wifi-iface
        option ifname 'wlan1-0'
        option device 'radio1'
        option mode 'ap'
        option ssid 'EAP-Test-2,4GHz'
        option encryption 'wpa2+ccmp'
        option auth_port '1812'
        option auth_secret '...'
        option dynamic_vlan '2'
        option vlan_tagged_interface 'eth0'
        option vlan_bridge 'br-vlan'
        option vlan_naming '0'
        option auth_server '...'

I have used this guide for setting that up: https://wiki.openwrt.org/doc/howto/wireless.security.8021x
Is this an issue or is my config wrong?

Regards from Germany!
Max