When adding another zoom level to a map by combining a map and a piece of paper in the cartographer's table, the resulting map in the output slot shows the same zoom level as the input map in the mouse-over "Scaling at... " text as well as the "Level ... /4".
Once the user takes the map out, the zoom level is correct is correct. Only the mouse-over of the target map while the map is not actually created is wrong.
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However, we are already tracking this issue, and this report is a Duplicate of MC-118140, which is a report that has not been resolved yet.
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