Mine was also restored.
Tho the mess over here, on a Xperia Z2, was absolutely a little mistake that costed the phone's life: I changed dpi setting under /system/build.prop and couldnt get the phone to startup properly (bootloop). So to get it connected to the PC, the only exit was to unlock the bootloader and flash some 3rd party recovery mode. By doing so I knew I was gonna lose DRM keys, TA Partition was gonna be screwed... anyway, I had to do it. So I got into the OS partitions, I copied (too late) the TA Partition that was still there, and I could make a backup of not much things... the recovery did some backup, I'll check later its contents. Very complicated to explain details of what I did, but after it, to get the phone back working, I downloaded a brand new stock firmware, which also restored my TA Partition and my DRM keys somehow...
I made a test. I used a tool (Backup-TA-9.11) that downloaded from the phone the new TA Partition. And then I compared it to the old one (using same tool), and I saw that the old one was totally f***d up!
I'm also happy I have my DRM Keys back with the TA Partition working!
Good luck people
HOW did you do that? are you sure about that? please check your service test/security if both first three lines are Ok.