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I have a 2015 450i MXU. Its electronic fuel injected. After I’ve been riding for  20-30 minutes and stop, put it in neutral and then put it in drive or reverse, as soon as I touch the throttle it stalls like I’ve turned a switch off. It starts up again without a problem and will drive fine. It happens every once in a while. It will also sometimes do it if I let it idle for a long period of time around 45 or more minutes. I first noticed this happening when I was letting it idle to keep the battery charged over the winter.
I’ve changed the spark plug and put in fresh 91 octane gas and it still happens.
 
Any ideas would be greatly appreciated.