So playtesting my TC Mod and I get this error when facing a supply ship in the polar region. Basically everything at this point is custom, but a quick test of turning off the UFO map replacement makes this work.
I'm able to run the exact same scenario with new battle and it launches fine, so I'm assuming it's something about how the maps are building in this one instance.
I did make my supply ship as large as the battle ship, but I don't know if that should matter since it does work pretty much every time I test in the simulator.
Is there something I'm missing configuring in my rule files or is this strictly a matter of the game expects a 20x30 map even though I set it to 30x30 for the UFO and it's somehow knocking my craft off screen? Looking at the map with the standard supply ship map there's a lot of water, so maybe with my larger ship map there's just no place left for the xcom craft to spawn? I suppose I can resize my ship, but would prefer to keep it as it is if possible.