Old bug that has been around for years
Buttons can't be placed near the edges of the screen, increasing the button size makes the issue worse
Affected buttons: Speed Boost, Drive, Reverse, Steering Left/Right, Auto driving, Tilt Up/Down (motorcycle)
Temporary work-around (shown at the end of the video) : make the button as small as possible, place it where you want, increase the size, then tap save (keep holding the button the whole time, otherwise it doesn't work)
Not a device specific bug, it's present on different phone models (ROG Phone 6, Xiaomi Mi 10T, Black Shark 4)