Xbox SW + Vanilla + cave = corrupt save

[CPANIC 0]

I’m playing on Xbox and had a great survival world with a huge base. I decided to link it to a SW world, so I created one and explored until I found the seaworthy, used it to link worlds and all was fine. Then I went into the caves to get stuff to craft the thing to get back to SW and now it crashes EVERY TIME I LOAD. The save says “cave L1” but it never generates the caves. Xbox just crashes back to the home screen. And now I’ve lost both worlds!  Weeks of work are GONE. Is there anything I can do?