¯\_(ツ)_/¯ I reverted the version back to 2023.6.0.92 and it's working just fine again. Couldn't say what's happening exactly.
For reference, I'm using the extention to open multiple windows of my game similar to a tutorial I found somewhere:
if( global.multiStart ){
var i;
for(i=3; i<=global.multiStartInstances+3; i++){
if (parameter_count() == i) {
if( i < global.multiStartInstances+2 ){
var k;
var paramStr = parameter_string(1)+" ";
for(k=2; k<=i; k++){
paramStr += parameter_string(k)+" ";
}
paramStr += "-secondary";
execute_shell_simple(parameter_string(0),paramStr);
}
var pNum = i-3;
var xPos = pNum%2;
var yPos = floor(pNum/2);
window_set_position(
100 + (global.resolutionX + 40)*xPos,
60 + (global.resolutionY + 60)*yPos);
window_set_caption("P"+string(i-2))
global.onlinePortNumber = 32770+i;//different ports for each game
global.connectIp = "127.0.0.1";
global.connectPort = 32790;
}
}
}
Basically just restarting the game with more and more parameters and opening windows based on how many parameters there are.