"Optimize page slices" adds a transparent pixel row

[slch]

"Optimize image slices" now adds a row of transparent pixels to the last slice of each original image. Which results in black lines in the reader.
Both on main & canary sites.
Checked my uploads where did run this feature: last upload without issues 2023.4.21, with 2023.4.23.
Tried running slicer on images from my last upload without such issue - it does add a row too, so it is not something wrong with the image.
Example chapter


Zoomed in image parts in image editing software (Krita):

Spoiler: Original

Spoiler: Slice

Original image from examples

 

[tristan9]

The bug has now been fixed... Can't believe we didn't realize it for that long... sigh... Thanks for the report.