With the new RTX update, there are some new graphical issues.

For instance, in the crystal palace demo, a number of textures have strange blue squares in them, such as grass.  See the Attached files.

Additionally, (new in 1.16) in the Razzle Berries RTX texture pack, there are blue squares in textures such as gravel.  Furthermore, in the same texture pack, there is strange striping on the grass that wasn't there before. See the attached images.

Running RTX 2060 with the latest nvidia driver, 452.06 (8/17/2020).

I have also restarted the computer, etc.  These issues weren't in the previous RTX beta (although I could imagine that maybe the Razzle Berries RTX texture pack need to be updated?)  But the Cyrstal Palace presumably shouldn't have this problem.