Resolved:

Change the function:

public function getBaseID($x, $y){
		return ((WORLD_MAX - $y) * (WORLD_MAX * 2 + 1)) + (WORLD_MAX + $x + 1);
	}

in the file GameEngine/Generator.php to:

public function getBaseID($x, $y){
		return ((WORLD_MAX - $y) * (WORLD_MAX * 2 + 1)) + (WORLD_MAX - $x + 1);
	}

And the coordinated will be calculated correctly.

I just setup a server for me to play around and that '+' to '-' change actually breaks the game for me, making both the map and attack coordinates unusable.
Reverting back the '+' to '-' is actually a fix for me.

Resolved:
...snip...
And the coordinated will be calculated correctly.

Applied this fix locally on my test system and gave it a quick test: appears it fixed my issue of being unable to raid some locations as well. Thank you.

My test system is:

• Ubuntu 20.04.4 LTS (5.4.0-104-generic) fully patched
• mysql-server-8.0
• php7.4

Guys, i think the fix is:

$a = ( WORLD_MAX - $y );
$b = ( WORLD_MAX - $x );  
if ( $b < 0 ) {
    	$b = -$b;
} 
return ( $a * (WORLD_MAX * 2 + 1) ) + $b + 1;

Tested doing:

SELECT* FROM `s1_wdata` WHERE ( ( 100 - y ) * 201 + ABS( 100 - x ) + 1 ) <> id

the result is empty