The Bug:

Flying around in a newly generated world I quickly found a couple of (possible) weird world-gen issues.

These issues are present in the screenshots that I included, with F3 details. All of these screenshots are made in the world with the seed specified in the steps to reproduce.

Steps to Reproduce:

• Generated a world using the seed: -994796562581097201
• Fly to the coordinates in the screenshots
  •  Spiky mountains
    • 129 118 -196
    • -578 136 -679
  • Lakes in the middle of the desert:
    • 212 76 -283
    • 157 97 -425 
  • Rough biome transitions + weird holes
    • -158 94 -610
    • -722 136 -641

Observed Behavior:

• Weird holes in the desert
• Deep lakes in the desert, that additionally seem to be cut-off too.
• Spiky mountains
• Rough/odd biome transitions

Expected Behavior:

Regular world generation without any of the issues stated.