Trailing sketch lines render inside the color palette after multiple additions

Nobody has claimed this yet.

Summary:
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After drawing several lines in sketch/drawing mode and saving, the most recently drawn line(s) render outside the photo/canvas boundary — appearing at the bottom of the screen and overlapping the color palette area — instead of staying within the photo.

Environment:
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Staging

Application
Device/OS: IPhone 15 / iOS 26.5
MM mobile 2026.3.0-RC2
iOS: 26.6.924211

Steps to reproduce:
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1. Open the photo/image editor.
2. Click the sketch icon to enter sketch/drawing mode.
3. Draw lines on the photo multiple times in succession.
4. Click the save button.
5. Click the sketch icon again to enter additional sketches and save it.
6. Observe the screen area between the photo and the color palette.

Expected result:
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All drawn lines stay within the photo/canvas area only.

Actual result:
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The most recently drawn line(s) also render at the bottom of the screen, overlapping the color palette area.

Screenrecord (see the last 10 seconds)

https://github.com/user-attachments/assets/24314774-5ade-473a-bd47-aab5ba06b247

Start in the iOS photo/image editor's sketch mode and reproduce the issue using the listed steps, drawing several lines, saving, then adding and saving more sketches. Use the screen recording to compare the canvas and color palette; done means every drawn line remains inside the photo/canvas boundary and does not overlap the palette.

Written by the indexing model from the issue text.