Commonly when i revert to the VAB, usually with a large or medium size rocket, my vehicle will appear mostly under the floor and with each part separated. loading the vehicle again or merging it to the current build dose not fix the issue. it just spawns inside the currently stuck vehicle. I have not run into this issue with planes yet
SPECS:
CPU: intel i7 11th gen
GPU: Nvidia GTX 1660
RAM: 32 GB
Screenshot (wont let up insert it)