Minimap magnification changes on its own

Riding in Makuri, I have been noticing that the minimap sometimes displays a very small area (magnification turned way up) without changing anything, and then eventually returns back to normal. Not being able to see where you are on the map just makes the world even more confusing (and of course I can’t tell if it happens in the same places if I never even know where I am).

So, today I noticed that the same thing happens on the NYC map as well, as you approach Harlem Hill (did 2 laps and same thing happened on both laps).

Baseline:
image

Getting closer:
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Next to 110th Street:
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Getting further away again:
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I would expect the magnification level to stay constant regardless of where I am on the map. I’m wondering if there is some scaling going on as you approach the edge of the map or something like that.