Encountered this problem for the last year, playing on VS beta 5, and as I see, I'm not alone.
When I create a working plane, which I can control using flaps, and then relaunch the world, plane becomes uncontrollable and pithces down, even though flaps are connected to rotation force.
Now I see a lot more VS versions. I'm playing on 1.20.1 with create 0.5.1j, and don't want to transition to create 0.6.0, because some of my mods I need very much (Valkyrien tournament, Create interactive, and CBC Advanced Technologies) doesn't support create 0.6.0.
Please tell me, was this problem solved on VS beta6-beta 12, or only at VS for create 0.6.0, or it's still actual and there is no solution?
It's important since I create a modpack for a public server and choice between newer VS and create versus Create 0.5.1 and VS betas is critical