Black Box over Layers when adding a New Color

Hi! So, whenever I try to add a new color to my palette, I get a bug where it draws a black frame around my current layer, as shown.

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The same box is created when trying to save the individual layers as PNG images.
This a recent bug that occurred both in 1.1.13 and 1.2.
If this is not a bug, what can I do to fix it?

Hi @ClyffeSmash, it might be caused by some “hidden” pixels that reappears when the new palette entry is added. Here a little video showing how this can be reproduced (we draw with a new color that then we remove, but then we add it again, the index data in the image is still present):

Hey, that seemed to do the trick! Thanks.

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