I:R - Area borders are invisible on flatmap

[Sobisonator]

Description of problem
Area borders are invisible on flatmap

What game version are you running?
2.0

What platform are you playing on?
Steam

Please select any/all DLC you have enabled.
(DID NOT ANSWER QUESTION)

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
When zoomed out to flatmap level, only the borders between territories within the same area are drawn. Any borders for territories that are in different areas are invisible, leading to unsightly gaps in the internal borders of countries.

I have attached a screenshot of Maurya, where this is particularly noticeable. I've also attached an image zoomed in to the flatmap with increased contrast to emphasise the issue.

Steps to reproduce the issue.
Zoom out to the flatmap in political or terrain view.

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File(s) attached

 

[Sobisonator]

I have looked into the files and the following defines seem to be broken (have no effect), which is almost certainly related to this bug:

NBorder = {
    #cull borders when zooming out
    MAX_ZOOM_STEP_PROVINCE = @province_zoomstep_max
    MAX_ZOOM_STEP_AREA = @state_zoomstep_max
    MAX_ZOOM_STEP_COUNTRY = -1
    MAX_ZOOM_STEP_SELECTED = -1
    MAX_ZOOM_STEP_HIGHLIGHTED = -1
    MAX_ZOOM_STEP_IMPASSABLE = @state_zoomstep_max
    MAX_ZOOM_STEP_BLOCKADED = @state_zoomstep_max
}

Nothing changes whenever I edit any of these defines.

The -1 value for country borders seems to suggest that the intended functionality is for country borders always to be visible, however those also disappear at the same zoom height that areas disappear.

the value "@province_zoomstep_max" is 7, but province borders are visible at all zoomsteps well beyond 7!

 

[Sobisonator]

This bug is super noticeable when you have selected a province:

The outline is glowing when zoomed in:

When you zoom out, the area is no longer highlighted - because area borders are no longer rendering