Invisible chests, crashing, and more.

So, me and my friend were on our server (it is over 7 years old, and has been going since Xbox 360) and we went to the storage only to find out that some of his chests were invisible. So I showed him and he seen it too and was very confused, because the day before the 1.16.100 update we were on it and it was all normal. (Also keep in mind he's playing on an Xbox Series X) So when we went to investigate, we tried to open the chest and about a moment later we got disconnected and Minecraft on his Series X crashed saying that he needed to reinstall the game. We tried again to see if it was just a small little error but the exact same thing happened again. So now we are thinking that when the 1.16.100 update came out it caused some issues, and honestly its getting a little annoying where every time there is a game update that something somewhere is ruined until the next update. (And it just loops and goes on and on..) Also, before hand, I realized that I was having frame rate issues when going to some parts of the world where there's no entities or anything in the area. Because I play on a 165Hz monitor and it always runs smoothly with no issues what so ever. And ever since the update, its been dipping from 165FPS to like 70-90FPS sometimes and according to task manager nothing is even at 40% usage. One last thing, when my friend hopped on today he noticed that his purchase of the faithful texture pack was gone and according to the game and his purchase history he does not own it even though he bought it almost a year ago. (Can't upload the video because it exceeds 10MB and the clip is like 35MB but if you guys need it I have it) But anyways, it would be nice if you fixed this soon, because it is starting to get really annoying. PS, can't wait for Caves & Cliffs!!

Specs:

Intel Core i5 9400f

AMD MSI RX570 8GB

12GB DDR4 2400MHz

WD Blue 1TB 3D NAND SSD

Gigabyte Aorus Elite Z390 

650W 80+ Gold Rosewill PSU

Asus 24" 1080p 165Hz 1ms TN LED G-Sync Monitor (VG248QG)