Chris Dixon

I'm personally not experiencing this, "chunks reverting back to set date". I'm only experiencing what appears to be an incomplete conversion, or a complete refusal of conversion of the same areas which becomes invalid, then renders new terrain generation in it's place. Also, my chunks near my world spawn are unaffected. My whole center map is okay. The biggest area affected for me is located at the top left map at the bottom right quarter of it, and another mid upper right quarter map somewhere i can't remember specifically. I'm sure there are other areas in my world that i haven't built anything at that are affected by this bug, i just haven't looked elsewhere other than where i have built, since that's what matters most to me in my world.

I can confirm this issue. I did some testing myself.

I have a survival world that I've had since December 2013 on Ps3 that i converted to Ps4 and have played on ever since. Converting the world to Bedrock came at no issue from what i could tell at first, despite the long conversion time from it being a larger in size world. Most of my world is fine but there are areas of chunk borders where there wasn't before. I have been building a 1:1 scale Titanic for the last few years and the back half has just been cut off with new ocean generation in it's place. Which, i find ironic since the ship was split in half upon sinking in real life. Go on, insert your iceberg and splitting in half jokes here. I'll make one for you, she didn't hit an iceberg this time, she hit Bedrock.

Furthermore, one of my old iron farm complexes with two mob farms has been entirely deleted, replaced with new world generation. There are other areas affected that are not mentioned. At this point, i will not play until this issue is fixed and i can convert my world without losing portions or the entirety of builds. I have too much invested into this world to start over or fix what I've lost. I've converted it 3 times now and it deletes the same blocks/areas every time. On the 3rd time converting testing this.. for me, it goes to 94% with no issues, then skips to 100%.

I will also note that the world size before converting is 288.0 MB. The end result is 354.1 MB. This stayed the same every time i converted.

I have also done another test. I switched back to the Ps4 Console Version and went around to both areas affected, and not affected. I loaded everything at each location and saved. The last location that i saved at was near the middle of the Titanic near where it was cut off and made sure the entire ship was within render distance in both directions, thinking this may make a difference. Again, conversion went to 94% then skipped to 100% and asked me if i wanted to play it, i chose yes.. And again, same blocks/areas deleted and replaced with new world generation. 

I also have a friend experiencing the same issue.