Output logs spammed with fetching packet. Causes crash?

When leaving the overworld and going to the nether, sometimes my game ticks freeze, thus making the game unplayable until I end the task via task manager.
The output logs look like this:

I am unsure if this is the cause, though when this does happen, my "server chunk cache" skyrockets up to the 5-digits.

(forceloading a potential cause? - unsure)