I'm working on a  rocket for a challenge. I've reached my part limit, and my rocket suddenly exploded after the launch. Then I tried to redesign it to lower the number of parts, but after I remove a specific fuel tank, a problem occurs. As long as I'm working in the VAB, everything looks fine, but if I want to launch the rocket or press Ctrl+Z or try to load it, I get an error message "Part 4293965038 missing" and my rocket is gone. Is there a way to fix it, and remove that fuel tank withou