With RTX, there is a strange issue with skins, statues and special items.

In some servers, the 3 of them appear gray :

In some others, skins appear normally, but not statues and special items :

And in some others, these three appear correctly :

I got returns that it would be a Minecraft bug. I thought by regarding the situation, that it could be the version of MC not up to date on server side causing this issue. What is the real story behind this glitch ? I let this issue in your hands

Specs :
CPU : Intel® Core™ i9-9900K CPU @ 3.60Ghz 3.60 GhZ
GPU : NVIDIA GeForce RTX 2080 Ti : Turing - 76T - Boost 1545 MHz - 11GB GDDR6 - Memory Speed 14 Gbps
RAM : 64 Go
Screen : Alienware 25" - DP/HDMI - IPS - 240Hz
(all drivers up to date)