Missing pixel in the polygon when using Mapbox

[srujner]

Blocked by #7092

ODK Collect version
beta version 2026.1.x

Android version
14

Device used
Samsung Galaxy M23

Problem description
I noticed two things here:

1. When the line of polygon is thick the mapbox creates something that looks like a double line.
2. There is missing "pixel" in the corner of some polygons

Steps to Reproduce:

1. Open link https://test.getodk.cloud/projects/427/app-users and scan user 1953
2. Set Map Source as Mapbox
3. Open Forms: SelectOneFromMapMykonos and ValidStyling
4. Click on the Select Place button
5. Zoom in to the corner of the square polygon
6. Notice that there is missing pixel in the corner of the shape

Expected Result:
There should not be any missing pixels

Screenshots:

First one

Second one

[seadowg]

I think I'm happy to let these sit for now, but we should address them if they still persist once we replace Mapbox and OSM with MapLibre (MapLibre might have the same issue). I'll schedule this and block it on that work.