I just did this same procedure (change agents, update, lock metadata, upgrade agent) on a single series to attempt to reproduce again (and to get cleaner/newer logs), and this time it did save as expected. I’m starting to wonder if my browser maybe wasn’t actually saving the changes I was making when I was updating all this data. I’m on a different PC today and there are other odd things in the web interface that are behaving slightly different now that I’m paying attention. Libraries are dynamically changing/refreshing and yesterday I had to keep refreshing every time I changed something.
I will investigate more on my side before bothering anyone further with this, however, this issue that spawned me to do all this is still happening and might be minor if someone could take a look. 
