Sadly, the easiest way to do large io copies is manually editing the save file. There seems to be some memory issue related to the game’s copy implementation.
Additionally, it’s best practice to put such large connection lists on a relay, this helps prevent the need for copying entirely.
I was editing a light switch and copied all connections using the button in the top right corner of the connections menu and when I pasted the connections in the switch off category the game crashed.
Just came to report the same issue - if it has any relation, mine were to color a button.
Just duplicating a bunch of buttons causes my game to crash but I’m also getting the same crash from just adding new entries to my button. My game crashes around the 140-150 mark every time.
edit: also deleting button connections causes my memory usage to go super high and the game crashes
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