Update: CD Projekt Red tweeted the the developers released a new hot fix that should increase the draw distance of foliage when playing in 4K on PS4 Pro. The fix applies to both the vanilla version and GOTY versions of the game.
Given how dedicated CD Projekt Red is to its Witcher franchise, it should come as no surprise that the studio is working on a fix for the bugs that came along with the recent 4K HDR update for the PS4 Pro. But it's still nice to get a confirmation that a fix is incoming.
CD Projekt Red relayed to USgamer that the studio is currently working on another fix for the graphical issues that bugged The Witcher 3 1.6 patch. No word on when the fix will arrive other than "it's in the works," but I imagine that the studio is well aware of the issues that came with the 1.6 HDR patch.
While the patch introduced HDR support to the PS4 Pro, it also caused issues with The Witcher 3's draw distance that made the game appear less detailed. Also things like foliage and other environmental details would just sprout from the ground a few feet away from where Geralt was running to.
Our colleagues at Digital Foundry have a fuller breakdown of the 1.6 Witcher 3 patch, but in summary the HDR patch might have unintentionally broken some of the game's visuals. The actual draw distance issue doesn't even appear to be related to the HDR implementation as the problems persist with HDR turned off. The only solution is to roll back the game's settings to the 1.5 version.
In the meantime, the HDR in The Witcher 3 does work well, and the performance has seen a boost. 4K frame rates are stable and the PS4 Pro is that much closer to the Xbox One X version in terms of graphical performance, though not matched.
For more, check out our complete Witcher 3 guide for a complete walkthrough. Or, if you're waiting for CD Projekt Red's next project, the studio is currently working on Cyberpunk 2077 which we might see at E3 2018.