'Allow coaster going off the track while editing' option now broken?

I always have this turned to off as I don't want the exploding coaster effect every time I'm building a coaster and prefer it to just disappear when the track ends, yet now (with it still turned off) the coaster is going off the track and exploding every time? Wonder if this is an introduced bug from the new interchangable coaster cars option in Update 2? (For context I haven't used any interchangeable cars and am building a Grand Coasters Worldwide wooden coaster.
 
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