Here are some issues I found so far, in no particular order:
● wifi will not connect to a hidden SSID network - normally the procedure is turn on SSID broadcast, connect to network, disconnect, hide SSID, turn on wifi and then it connects again. Previous ROMs on this device have done this, PA 9 doesn't for me. (the app "Hidden SSID enabler" no longer works either)
This one is solved.
New in Pie -- you don't have to temporarily broadcast the SSID as before. When you connect a new wifi network with hidden SSID, after entering the password, fold away the keyboard, otherwise there is not enough room on an X compact screen, select Advanced Settings, scroll all the way down to the bottom, there is a setting for Hidden SSID. Flip that to Yes/On and you're set.