I'm having a weird bug with drag being produced by parts that are stowed inside a cargo bay.
The weird thing about it is how inconsistent it is. I designed my plane in the SPH, when I launch it it takes off, accelerates, goes supersonic and to orbit, no problem. If I revert to launch and try again though, this time the parts inside the cargo bay are producing excessive drag and this time my plane won't even pass the speed of sound. I had the bug once during testing, I sort of dismissed it,