Testing things out days later, I’m finding this bug is not being reproduced and my plane is not spawning in the parking area with the windows coated in frost, unable to defrost. So I think it was nothing to do with my startup procedure. But rather some bug with the simulation, possibly with the Live Weather at the time, causing the plane and its systems to somehow spawn impossibly cold and unable to warm up leading to performance issues. Even thought in my later testing I spawned into colder temperatures without issues. I know how buggy Live Weather can be in general so I guess this is totally plausible.
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