Niantic has announced that they will be testing visual changes to the Pokémon GO experience including the in-game Pokémon GO map and encounter screens.

Testing visual changes to the Pokémon GO experience

Trainers,
In the coming months, we’ll be testing visual changes in certain parts of the world.

We continually strive to improve the Pokémon GO experience. As such, we want to ensure the changes we make are beneficial to—and make a strong, positive impact on—the greater community, as well as each individual Trainer’s experience, before we launch them globally.

Trainers in these regions may see the following:

• Visual changes to the in-game Pokémon GO map, including encounter screens.

Source: https://pokemongolive.com/en/post/visual-testing-2024/