Every world that I have made recently is overloaded with savannas and jungles

Practically every world I make is overwhelmed with savannas and jungles (mostly savannas) that are 100s of blocks long and seem impossible to escape.

This has been happening to me for several days. At first, I thought I was just unlucky, but it continued and still does.

Here is a randomly generated seed I got that might show what I have been experiencing.
-2887128273296969351