Use blottopograh, "an app" and select the missing chunks, then delete them, this will reset everything you selected and will make it a new chunk and will load in
If you want to fix this I suggest you use an app called blocktopograph and use the begin section then cover the area affected by the corruption then delete the chunks and go back to minecraft, and it should be fixed
But it will reset it, like if it was new
though that they were trying to replicate java