Chunks don’t load,

I was testing the new 1.18.0.20 in a copy of my realm world, I came across some awesome new caves, but then came across chunks that didn’t load in, my idea is that the world was created but in 1.15 some time, and I think those chunks are unable to load in the new caves, but I hope this can be fixed, 

 

here’s video of the missing chunks, video was too large to upload https://twitter.com/minecraftnews_3/status/1446141413356449794?s=21

 

Really think my world should be looked at, my world has a huge void hole if you go to -622 -35 1800, it goes on a long ways of unloaded chunks, 

 

Here is the world, https://www.dropbox.com/s/isvuqytcte5t7d4/Realm%20world%20Copy.mcworld?dl=0