This one is rather concerning.
The Toyota GR Supra wouldn't have existed were it not for BMW's involvement, but that association also means that the Supra can be subject to BMW recalls. The first of these came to light in 2019 and was minor. Like a later recall from November 2020, it affected both the Toyota Supra and the BMW Z4 which are both built by Magna. This came about as a result of an issue with improperly welded fuel tanks. A couple of days ago, another BMW recall was announced, and this affected BMW, Mini, Rolls-Royce, and again, Toyota's Supra. The recall woes are not over though, as BMW has announced another that could affect the braking system.
The latest recall affects 13,014 Supras from the 2020 and 2021 model years as a result of the potential loss of braking assist power. The recall isn't isolated to just Supras either, with a number of BMW models getting recalled too, including the following: 2020 M340i, 2020 540i, 2020 X3 M40i, 2020-2021 X4 M40i, 2020-2021 745Le, and the 2019-2021 Z4 M40i. In total, 50,024 cars are affected by the one recall, which BMW says originates with faulty engine management software that "could damage the oil/vacuum pump which supplies vacuum for brake assistance."
This means that your brakes still work, but without any power assistance.
The vacuum pump gets damaged by very specific engine start conditions, including pressing the engine start/stop button twice in quick succession or depressing the brake pedal very briefly when starting or stopping the car. As you can imagine, this sounds like a normal start/stop procedure, but it still can cause a brief reverse rotation of the crank, thus damaging the pump. If this pump is undamaged, new software is all it will take to fix, so it's best to get your car checked before the vacuum pump sustains severe damage. Until resolved, BMW advises firmly pressing the brake until the engine has begun idling stably and don't press the button twice if you can help it.