Since the release of TU15 targeted loot has not been working in any DZ. Regular or Invaded. Regular enemies, bosses, and landmark rewards don't drop targeted loot anymore. I'm certain bosses normally drop at least one targeted loot on average. Right now they just drop one random piece of gear: (https://streamable.com/uoqmxd). Currently the total amount of loot per landmark including the clear reward is 2 or 3.
@google-1234 Hi there!
The targeted loot problem described in this thread is known to the team. Regrettably, we don't have any updates to share on this at the moment, and the team are continuing to investigate.
Apologies for our delayed response here. If you have any questions in the meantime, please be in touch.
No problem at all @google-1234 , hopefully we'll have news on this to share in the future!
Hello there!
Our dedicated teams are still looking targeted loot not dropping in the Dark Zone. We don't yet have any updates to share from the investigation at this time. Please note that the Player Support team is unable to speculate on how long the investigation into this issue may take, or when any resolutions may be available. Any updates will be made available within patch notes published within the News & Announcements forum, so I recommend keeping an eye out for these.
Thanks! 
Hey @SuspiciousPixel ,
As noted in this thread - this is still being looked into.
I've pinned @Ubi-Borealis' post for better visibility.
Please keep an eye on the News and Announcements channel for information when a fix is expected.
Thank you!
devtrackers.gg