I know this is 5 years later, but the fix for me was the following
Under Vlan/Bridge Settings which is under advanced.
Go to By VLAN tag group and create a new group called "LAN" in the vlan ID box call it vlan 1 and select up to 3 Wired and 2 wireless (keeping one Wired port free)
After doing this click apply
Next and this is the most important step under where you see this new group. Make sure where it says "Enable" , Untick it!
For some reason what this does it keeps your one wired and one WAN as the one single vlan ID you require for internet.
And then it sets the rest of your wireless and wired as vlan 0, making communication work again across the different ways of communication (wired, wireless, 2.4/5ghz)
I'm also on the beta version XR500 V2.3.2.134-dumaos33-rc14
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