Entering certain chunks causes FPS drops

Entering certain chunks from West to East (towards positive X) along the Z axis causes a lag spike.

I apologize for the lack of information, but I'm uncertain of the conditions that cause this. Playing this world regenerated with the same seed offline does not reproduce the bug.

Edit: This bug doesn't seem to only happen when moving +X. It now occurs with random chunks and directions. Again, I have no idea what the conditions are for causing this.

Here's more footage with the bug in Vanilla: https://youtu.be/tQChac9CJYc
New observed behavior: https://www.youtube.com/watch?v=HXuN5M0fEo0
GDrive link to the compressed world file: https://drive.google.com/file/d/1Jeur5KxOR-RIPLqB71wrV1g0cFDnzz3S/view?usp=sharing