Features are not angled correctly when rotated

[aco4]

Screenshot

In the image below, the oil derrick should be angled towards the East, since the terrain slopes down towards the east. But it has been rotated 180 degrees, causing it to be angled towards the West instead.

To Reproduce

Start a skirmish game with the script-generated map below (rename .zip to .wz)

10c-Lekiro.zip

The oil derricks are rotated with the following script:

features.push({
    name: "OilResource",
    ...
    direction: gameRand(4) * 0x4000,
});

This gives them a random rotation of 0, 90, 180, or 270 degrees. Thus, about 1/4 of the oil derricks in the map have a rotation of 0 degrees and are angled correctly. The other 3/4 are angled incorrectly.

Expected Behavior

The feature should be angled correctly regardless of rotation

System

• OS: Windows 11
• Game version: 4.5.5

Additional Context

I expect that issue is not limited to script-generated maps, and occurs in hand-made maps as well. Needs testing.