[MC-250053] Newer texture files retain Aseprite data

Certain textures retain Aseprite data, mainly old palettes saved to the texture as well as being in indexed color mode. How to replicate:

1: Download Aseprite if you don't have it.
2: Open up any 1.19 texture. I'll use mud bricks here.
3: There's an added color in the palette that isn't in the final texture, as well as the color mode being indexed despite my default being full RGB. This is indicative of Aseprite data being retained in the texture, which could affect the storage size of the texture.

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⚠️ Please do not mark Unreleased Versions as affected. You don't have access to them yet.

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Here is the mud bricks file, where is the aseprite data?