Now I test and confirm. Just default ama_fild01 zoomed and opened without Direct3D HAL:
There are no custom objects, textures, some changes, etc.
+ are working good options (first NVIDIA GeForse hides [Direct3D HAL] too I suppose); - are non-working options.
Knowing this, it's hard to believe that players faced such a problem only on your map : )
With the rest of the parameters, the map looks good : ) These "rainbow" lights in the edge of map will disappear as soon as you reopen the map in Browedit, just a visual bug.
If you look at the standard maps they all have only 3 colors: green, red and purple.
Moreover, no one guide states a requirement to use light blue instead of green in Brow.
And if you save any 620 map with green cells in 586, these will remain green.
Map.c says that the water level is read from .rsw file.
In my case, since I use the WeeMapCache, I collect 3 files (.gat, .gnd, .rsw)
in the grf, then add the map via the GRF button in the WeeMapCache.
And the skills that require water work only in water = the water level
is read correctly (with green cells). I'm sure you do not need to redraw
the GAT cells, just need to find a way to make the server read the .rsw file.
w0wZukuBg's post in Map Graphics Bug was marked as the answer