Created attachment 177737 [details]
I'm testing this as well... seems OK so far.
I had a box with UniFi AP-LRs, which failed with 5.2.9. Works now with 5.3.8.
A commit references this bug:
Date: Wed Dec 7 20:38:28 UTC 2016
New revision: 428086
net-mgmt/unifi5: Update to 5.3.8