Hi when playing around with the minimap zoom when modding I found that the zoom level is different when initializing vs setting it via the element.
For example this:

local minimap = map_frame.add{
type = "minimap",
name = "minimap"
zoom = 1.0
}

vs this will yield two different zoom levels ...

Hey ran into the same problem here when playing with the zoom values. Seems like zooming has changed. If you use

local minimap = map_frame.add{
type = "minimap",
name = "minimap",
zoom = 1.0
}

Seems like the zoom is the new value. Whereas if you did this instead

local minimap = map_frame ...