While the game starting generating the World, for some reason the current loading screen will close and then instantly open a new one, causing the screen animations play again, this has been an issue since 1.14 (Buzzy Bees update)

Steps to reproduce:

1. Download and apply attached resourcepack, which add an fade in/out and offset in/out screen animations to the loading screen
2. Enter any world, and wait until the game start to generate the World (when panorama stop rotating)

Expected results:
Screen animations doesn't play again.

Observed results:
Screen animations play again.

Note:
This can be reproduced without using the attached resourcepack, it just very noticeable while using it.

If tested without using the attached resourcepack, one of these will occurs:

• The screen will become blank for about 0.05 seconds when the game starting generate the World.
• The new opened loading screen overlap with the old one, causing the loading tips to be overlapped with a new one and the transparent dark background inside loading tips window to become slightly opaque for 0.05 seconds.