Entire forest biome disappeared

I was doing the Lunar Events and managed to kill the last pillar, however, my audio was bugged, so I decided to Save and Exit the game right as I killed the pillar. And I did that. However, just as I joined back, I noticed that when I was home, I didn't see the forest biome background. Instead, I saw the nearest biome's backgrounds, those being Desert and Glowing Mushroom biome. I went to check other forest biomes and they were fine, it was just this one. This honestly seems like an unfixable issue, so if there's anything that can be done to rid of this bug, I'd be more than thankful to know. I did try to do the Lunar Events and kill Moon Lord again, but it did nothing.