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I moved an oxide asteroid filter slot in a rare Asteroid Collector Filter list to the end, past the blank one, this created a blank slot before the oxide asteroid, I then moved that blank slot to the end past the oxide asteroid, upon release of the mouse button, the game crashed.

I expected the extra empty slot to disappear.

This bug doesn't occur while an arm is moving and behaves as expected; this also seems to prevent the bug from occurring on successive attempts with that asteroid collector. except when it doesn't prevent it and crashes anyway, I'm not entirely sure why.

The attached Save File includes a space platform with the already filters arranged in: Blank, Promethium, Blank. in an Asteroid Collector, Drag the first blank slot over the second blank slot to crash.

Thanks for the report. Issue is now fixed for 2.0.46 - it wont crash. As for the expected behavior, dragging slots is supposed to swap 2 filters so by moving first slot out you will simply swap empty slot with empty slot and nothing will change.