Trying to update Lumina via the ports to the latest 1.3.0 didn’t play nicely with portmaster. Kept complaining about a circular reference with the Lumina Archiver.
It seems the Meta port now needs to be deleted before the Lumina-Core port can be updated, but that is not mention in UPDATING. But a quick SUDO PKG DELETE LUMINA seemed to do the trick and I was then able to build the new Lumina-Core from the dedicated port directory.
I have yet to check if I now need to install all the other new Lumina ports, but Chromium works fine which is all I am normally using it for.
On the plus side I also notices that MATE-SESSIONS was also no longer installed and MATE had ceased firing up from STARTX, but installing that port again has restored MATE to full working order as well.