Ham.24

I had been building in my world on forge 1.15.2 for a while now and it had go to the stage where i was wanting and needing to use new blocks. However when i downloaded Forge for 1.16.1 my game continued to crash, i ignored this and decided to go back and play in my world in 1.15.2. However when i loaded back into my world the area i was building in had a completely different chunk loaded from a different world (which didn't match the terrain). Some of my other builds were saved outside the radius but however my main project which had taken me 5 months so far was gone. Unfortunately i do not have a back up of the world and I was wondering if anyone could give me any tips on if its fixable or not? Thanks a lot!

I have a world in Minecraft in which I was building a castle which had taken a very very long time. Recently Forge 1.16.1 has been released so i downloaded it to ease up the building process. However when I downloaded it my game constantly kept crashing. This i didn't mind dealing with but, later when i went to load back into the world in Forge 1.15.2 I loaded into the world and found that the area surrounding my build had completely transformed into a new biome eradicating all the builds. Unfortunately, I did not have a back up and are not sure whether or not it is possible to restore the world. Any clues? Thanks.