I am new to OpenWRT after being a long time DD-WRT user. I am using it only on a handful of Linksys WRT3200ACMs as Dumb APs. I recently fought through an ugly issue with ver 21 (up through 21.02.3) concerning DSA and its use for passing VLAN traffic for a guest account. I didn't find much help on this forum but did get a lot of assistance from one of the pfSense support folks (my primary router is Netgate/pfSense). In his research, he found in your problem tracking that the problem specific to the WRT3200ACM (and probably other mvebu/cortexa9 boxes) was known and a fix was in the early June Snapshots. I did load one test box with the June 6 snapshot and applied all the same configuration settings I had been using (unsuccessfully) and was very pleased to see that the Guest network via VLAN was indeed, fixed. My thanks to whomever worked on that!!
My question: Is there any sort of timeline on when this fix will make it to release... either ver. 21 or 22? It is not in 21.02.3.