This definitely sounds like a bug, especially that it's happening in multiple systems. Iirc, the derelict freighter generation is locked to the seed of the system it loads into; so if something had bugged on that particular freighter, it would be wildly improbable to occur elsewhere.
Every now and then a der. freighter is bugged in some way eg a blocked corridor, but this doesn't sound like that. You've done all you can so far really, I would explore other game systems until the next patch drops... and not to build expectations, but the NMS team are incredibly responsive to bug reports. You prob won't hear from them, but it will prob be patched soon (check the notes for subsequent updates)