Game-breaking bug - stuck on Pandora and can't fast-travel/progress

Hey all, I’m stuck on Pandora and can’t progress since the Fast Travel station in Sanctuary is completely gone. This happened because of some funkiness with split screen somehow. Has anyone else ever experienced this bug and know how to fix it? For reference, here is a similar post I found, but it’s unclear if their suggestion will actually fix it. I don’t have PSN so I can’t test it.