They did nothing. Until they implement a proper transactional transactional system for server transfers, duping will be NEVER fixed. That would be fixed also tribe, dinos and item lose on transfer with crash before worldsave. Fixing some random minor glitches and adding 15 minutes cooldown sync to worldsave is nothing aginst duping. They simply do not care at all, just have a look at bug bounty prices they give on server crashing/duping exploit compared to everything else. They do not care at all about major issues, doesn't matter the cost for fixing them, like scheduling the damn updates, giving more than 15 minutes announcements. A lot of people lost everything for these damn 15 minutes only announcment 'cuze they were doing tek cave! Nor they care about structure spamming on PVE, or obscene and heavy structures that prevent people to build, like giant gacha towers 'cuse the don't wanna implement different dino mechanics between PVP and PVE (like removing or lowering gacha distance debuff on PVE). Nor they care about 123 and VPN users, or doing about something against PVE insiders (like removing ballisttics and explosion friendly fire damages on PVE, magmasaur fire bomb included!). They are spending more time and money for that useless animated series than fixing basic and simple to solve issues of the game! We still have that uselss and non-working dyanamic tessellation option ingame. And also film grain doesn't work at all. They did nothig against ocean platform spamming, like limitating the ocean platforms per user on a map. Nor they did anything about to fix the tribe structure range that are broken (they randomly overlap, sometimes a pillar has precedence about a dino gate that was first placed after a server restart). Their crap anti-meshing system is totally broken. The 500 tame limit is instanly high, especially on PVE. We can continue all day to list all the major issues they are not fixing since 6 years of game. And half of them are simple to fix, like changing an ingame costant.