: 1.17 introduced the foundation for the "Caves & Cliffs" update. While the height limit didn't fully expand until 1.18, 1.17 added many blocks (Copper, Deepslate, Axolotls) that won't exist in your 1.14 chunks.
: Travel to a new area in the Nether to ensure the 1.16 biomes are generating correctly. To give you a more accurate review, could you tell me: 1-14_to_1-17.zip
If this ZIP is a , do not overwrite your 1.14 original yet. Extract the ZIP to your saves folder. 1.17 added many blocks (Copper
: Moving from 1.14 directly to 1.17 often creates "cliffs" or harsh borders between old explored terrain and new 1.17 terrain. 1-14_to_1-17.zip