I’ve been riding for over 50 years, and I’ve owned GSes and RTs, along with lots of other makes and models, and currently have a 2016 R1200R and a 2017 R9T Scrambler in the garage. None of the boxers have ever had a “left side cylinder oil issue”. Collectively, I’ve put hundreds of thousands of kilometers on the boxers. None of them have been even close to standing so upright on the side stand as the R1200R. And none of them have ever fallen over while parked, except for the R1200R. The wind blew it off its side stand while parked on perfectly level pavement. I was standing beside it at the time. The wind was brisk, but my other bikes have certainly withstood higher winds than that, including on top of Mt Washington (one of the windiest spots on earth). The pre-load was set to 2-up with luggage, and I’d learned early on to unload the suspension before shutting it off.
The side stand on this model is simply too long, no matter what BMW might say about it being within spec. When I park it outdoors, I look for a spot where the foot of the side stand will be lower than level with the tires.