The panorama isn't slightly blurred anymore which causes some "flickering" effects

In 1.21.5, the main menu panorama textures had a subtle blur/antialiasing effect. In 25w16a this is no longer present, which causes some flickering or shimmering to occur when the panorama is rotating.

Steps to reproduce

1. Start 25w16a

2. Look at the sun through the trees on the left-hand side

3. Notice how as the panorama rotates, there is a lot of flickering

4. Close the game and start 1.21.5

5. Look at the same trees

6. Notice how there is much less flickering as expected

I've attached a video which shows this (although it doesn't show up as much on a recording), as well as screenshots