Open your 26.1 game, create any world, do something randomly, and then use the red cross in the top right corner of the game window to exit the game. At this point, it should display 'Saving World' and close the window shortly after.
The 'Saving World' page consists of two parts: one is the text box showing 'Saving World,' and the other is the background (the newly updated background image from version 1.21.11). If you perform the above steps in the 26.1 game, you will notice that the background image rotates especially fast while the world is being saved.
Under normal circumstances, even if you use the red cross in the top right corner of the game window to exit, the background image should rotate at a normal speed and the game window should close and save shortly after. However, in the new version, the background rotates quickly while saving the game, which is quite strange.(The following video has not been sped up)
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We're tracking this issue in MC-305103, so this ticket is being resolved and linked as a duplicate.
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