Array contents get randomly corrupted

[SilentPhil]

Hi, I came across your comment under the discussion of a bug in game maker's bug tracker. YoYoGames/GameMaker-Bugs#2253
I'm having similar problems in my project, now I'm trying to find something in common between your code and mine to come up with a solution to the problem.
If you are able to reproduce the bug, can you try replacing array_concat with your implementation? For example with:

function array_merge() {
	var final_arr = [];
	for (var i = 0; i < argument_count; i++) {
		array_copy(final_arr, array_length(final_arr), argument[i], 0, array_length(argument[i]));
	}
	return final_arr;
}

I have a suspicion that it may be a bug in the new array-related functions. But I can't check it, because in my project array corruption is rather random.