I have just made the update. The interface itself is barely usable. CPU tops out from time to time without having any traffic and LAN2 and LAN3 interface are flip flopping every 10 seconds or so like loosing connection :( Some help would kindly be appreciated.
Best check which process is busy first, from the (ssh) console, you can use the following command:
ps -axfu
One of the issues that I found and now appears to be ok at leats for this is that on the device I have bridge connection made between 3 LAN ports. After the update I was seetings lots of output errors. I disabled the Spanning Tree Protocol and now no more output errors appear. At least for now.
Issues mainly arise when using Zenamor. Native netmap is no longer working and only emulated.
Issues mainly arise when using unsupported versions of ZA on OPNsense