1.16.100 Update Bugs

I was in the Nether, riding a strider, the game was lagging a LOT. I've been playing the world for about a week and no lag, and I was like YAY new update but all I got was problems. The strider would not follow my command when I needed it to, there was so much lag no problems before the update. I died because the strider froze for a long time, suddenly I was suffocating in a wall but the game showed me as in open lava area. The strider would not move still, so I left the game. Came back and I was dead! I lost a lot of good items, so I cheated and got them back from creative. I'm fine without achievements, but then I died AGAIN from nether lag. I couldn't place or mine blocks, and a magma cube killed me because I could not hit it at all for about 10 seconds. Too late. Please fix